From 99b2109c64dbc796bfcea0beeeadb28e4b4298bc Mon Sep 17 00:00:00 2001
From: aceforeverd <aceforeverd@users.noreply.github.com>
Date: Wed, 21 Feb 2024 06:20:49 +0000
Subject: [PATCH] docs(udf): upgrade udf list

---
 docs/en/reference/sql/udfs_8h.md | 622 +++++++++++++++++--------------
 docs/zh/openmldb_sql/udfs_8h.md  | 622 +++++++++++++++++--------------
 2 files changed, 676 insertions(+), 568 deletions(-)

diff --git a/docs/en/reference/sql/udfs_8h.md b/docs/en/reference/sql/udfs_8h.md
index 9cfab05977f..9fc3d807470 100644
--- a/docs/en/reference/sql/udfs_8h.md
+++ b/docs/en/reference/sql/udfs_8h.md
@@ -86,6 +86,8 @@ title: udfs/udfs.h
 | **[log2](/openmldb_sql/Files/udfs_8h.md#function-log2)**()| <br>Return the base-2 logarithm of expr. |
 | **[lower](/openmldb_sql/Files/udfs_8h.md#function-lower)**()| |
 | **[make_tuple](/openmldb_sql/Files/udfs_8h.md#function-make-tuple)**()| |
+| **[map](/openmldb_sql/Files/udfs_8h.md#function-map)**()| <br>map(key1, value1, key2, value2, ...) - Creates a map with the given key/value pairs. |
+| **[map_keys](/openmldb_sql/Files/udfs_8h.md#function-map-keys)**()| <br>map_keys(map) - Returns an unordered array containing the keys of the map. |
 | **[max](/openmldb_sql/Files/udfs_8h.md#function-max)**()| <br>Compute maximum of values. |
 | **[max_cate](/openmldb_sql/Files/udfs_8h.md#function-max-cate)**()| <br>Compute maximum of values grouped by category key and output string. Each group is represented as 'K:V' and separated by comma in outputs and are sorted by key in ascend order. |
 | **[max_cate_where](/openmldb_sql/Files/udfs_8h.md#function-max-cate-where)**()| <br>Compute maximum of values matching specified condition grouped by category key and output string. Each group is represented as 'K:V' and separated by comma in outputs and are sorted by key in ascend order. |
@@ -501,13 +503,13 @@ Compute average of values.
 Example:
 
 
-| value   |
+| value     |
 |  -------- |
-| 0   |
-| 1   |
-| 2   |
-| 3   |
-| 4   |
+| 0     |
+| 1     |
+| 2     |
+| 3     |
+| 4    |
 
 
 ```sql
@@ -541,13 +543,13 @@ Compute average of values grouped by category key and output string. Each group
 Example:
 
 
-| value  | catagory   |
+| value    | catagory     |
 |  -------- | -------- |
-| 0  | x   |
-| 1  | y   |
-| 2  | x   |
-| 3  | y   |
-| 4  | x   |
+| 0    | x     |
+| 1    | y     |
+| 2    | x     |
+| 3    | y     |
+| 4    | x    |
 
 
 ```sql
@@ -586,13 +588,13 @@ Compute average of values matching specified condition grouped by category key a
 Example:
 
 
-| value  | condition  | catagory   |
+| value    | condition    | catagory     |
 |  -------- | -------- | -------- |
-| 0  | true  | x   |
-| 1  | false  | y   |
-| 2  | false  | x   |
-| 3  | true  | y   |
-| 4  | true  | x   |
+| 0    | true    | x     |
+| 1    | false    | y     |
+| 2    | false    | x     |
+| 3    | true    | y     |
+| 4    | true    | x    |
 
 
 ```sql
@@ -634,13 +636,13 @@ Compute average of values match specified condition.
 Example:
 
 
-| value   |
+| value     |
 |  -------- |
-| 0   |
-| 1   |
-| 2   |
-| 3   |
-| 4   |
+| 0     |
+| 1     |
+| 2     |
+| 3     |
+| 4    |
 
 
 ```sql
@@ -946,13 +948,13 @@ Compute number of values.
 Example:
 
 
-| value   |
+| value     |
 |  -------- |
-| 0   |
-| 1   |
-| 2   |
-| 3   |
-| 4   |
+| 0     |
+| 1     |
+| 2     |
+| 3     |
+| 4    |
 
 
 ```sql
@@ -987,13 +989,13 @@ Compute count of values grouped by category key and output string. Each group is
 Example:
 
 
-| value  | catagory   |
+| value    | catagory     |
 |  -------- | -------- |
-| 0  | x   |
-| 1  | y   |
-| 2  | x   |
-| 3  | y   |
-| 4  | x   |
+| 0    | x     |
+| 1    | y     |
+| 2    | x     |
+| 3    | y     |
+| 4    | x    |
 
 
 ```sql
@@ -1032,13 +1034,13 @@ Compute count of values matching specified condition grouped by category key and
 Example:
 
 
-| value  | condition  | catagory   |
+| value    | condition    | catagory     |
 |  -------- | -------- | -------- |
-| 0  | true  | x   |
-| 1  | false  | y   |
-| 2  | false  | x   |
-| 3  | true  | y   |
-| 4  | true  | x   |
+| 0    | true    | x     |
+| 1    | false    | y     |
+| 2    | false    | x     |
+| 3    | true    | y     |
+| 4    | true    | x    |
 
 
 ```sql
@@ -1080,13 +1082,13 @@ Compute number of values match specified condition.
 Example:
 
 
-| value   |
+| value     |
 |  -------- |
-| 0   |
-| 1   |
-| 2   |
-| 3   |
-| 4   |
+| 0     |
+| 1     |
+| 2     |
+| 3     |
+| 4    |
 
 
 ```sql
@@ -1374,13 +1376,13 @@ Compute number of distinct values.
 Example:
 
 
-| value   |
+| value     |
 |  -------- |
-| 0   |
-| 0   |
-| 2   |
-| 2   |
-| 4   |
+| 0     |
+| 0     |
+| 2     |
+| 2     |
+| 4    |
 
 
 ```sql
@@ -1450,14 +1452,14 @@ It requires that all values are non-negative. Negative values will be ignored.
 Example:
 
 
-| value   |
+| value     |
 |  -------- |
-| 1   |
-| 8   |
-| 5   |
-| 2   |
-| 10   |
-| 4   |
+| 1     |
+| 8     |
+| 5     |
+| 2     |
+| 10     |
+| 4    |
 
 
 ```sql
@@ -1568,13 +1570,13 @@ It requires that values are ordered so that it can only be used with WINDOW (PAR
 Example:
 
 
-| value   |
+| value     |
 |  -------- |
-| 0   |
-| 1   |
-| 2   |
-| 3   |
-| 4   |
+| 0     |
+| 1     |
+| 2     |
+| 3     |
+| 4    |
 
 
 ```sql
@@ -1652,11 +1654,11 @@ window w as (partition by gp order by ts rows between 3 preceding and current ro
 ```
 
 
-| id  | gp  | ts  | agg   |
+| id    | gp    | ts    | agg     |
 |  -------- | -------- | -------- | -------- |
-| 1  | 100  | 98  | 98   |
-| 2  | 100  | 99  | 99   |
-| 3  | 100  | 100  | 100   |
+| 1    | 100    | 98    | 98     |
+| 2    | 100    | 99    | 99     |
+| 3    | 100    | 100    | 100    |
 
 
 
@@ -2259,13 +2261,13 @@ The offset in window is `nth_value()`, not `[lag()](/openmldb_sql/Files/udfs_8h.
 Example:
 
 
-| c1  | c2   |
+| c1    | c2     |
 |  -------- | -------- |
-| 0  | 1   |
-| 1  | 1   |
-| 2  | 2   |
-| 3  | 2   |
-| 4  | 2   |
+| 0    | 1     |
+| 1    | 1     |
+| 2    | 2     |
+| 3    | 2     |
+| 4    | 2    |
 
 
 ```sql
@@ -2630,6 +2632,58 @@ make_tuple()
 
 * [...] 
 
+### function map
+
+```cpp
+map()
+```
+
+**Description**:
+
+map(key1, value1, key2, value2, ...) - Creates a map with the given key/value pairs. 
+
+**Since**:
+0.9.0
+
+
+Example:
+
+```sql
+
+select map(1, '1', 2, '2');
+-- {1: "1", 2: "2"}
+```
+
+
+**Supported Types**:
+
+* [...] 
+
+### function map_keys
+
+```cpp
+map_keys()
+```
+
+**Description**:
+
+map_keys(map) - Returns an unordered array containing the keys of the map. 
+
+**Since**:
+0.9.0
+
+
+Example:
+
+```sql
+
+select map_keys(map(1, '2', 3, '4'));
+-- [1, 3]
+```
+
+
+**Supported Types**: 
+
 ### function max
 
 ```cpp
@@ -2653,13 +2707,13 @@ Compute maximum of values.
 Example:
 
 
-| value   |
+| value     |
 |  -------- |
-| 0   |
-| 1   |
-| 2   |
-| 3   |
-| 4   |
+| 0     |
+| 1     |
+| 2     |
+| 3     |
+| 4    |
 
 
 ```sql
@@ -2696,13 +2750,13 @@ Compute maximum of values grouped by category key and output string. Each group
 Example:
 
 
-| value  | catagory   |
+| value    | catagory     |
 |  -------- | -------- |
-| 0  | x   |
-| 1  | y   |
-| 2  | x   |
-| 3  | y   |
-| 4  | x   |
+| 0    | x     |
+| 1    | y     |
+| 2    | x     |
+| 3    | y     |
+| 4    | x    |
 
 
 ```sql
@@ -2741,13 +2795,13 @@ Compute maximum of values matching specified condition grouped by category key a
 Example:
 
 
-| value  | condition  | catagory   |
+| value    | condition    | catagory     |
 |  -------- | -------- | -------- |
-| 0  | true  | x   |
-| 1  | false  | y   |
-| 2  | false  | x   |
-| 3  | true  | y   |
-| 4  | true  | x   |
+| 0    | true    | x     |
+| 1    | false    | y     |
+| 2    | false    | x     |
+| 3    | true    | y     |
+| 4    | true    | x    |
 
 
 ```sql
@@ -2789,13 +2843,13 @@ Compute maximum of values match specified condition.
 Example:
 
 
-| value   |
+| value     |
 |  -------- |
-| 0   |
-| 1   |
-| 2   |
-| 3   |
-| 4   |
+| 0     |
+| 1     |
+| 2     |
+| 3     |
+| 4    |
 
 
 ```sql
@@ -2861,12 +2915,12 @@ Compute the median of values.
 Example:
 
 
-| value   |
+| value     |
 |  -------- |
-| 1   |
-| 2   |
-| 3   |
-| 4   |
+| 1     |
+| 2     |
+| 3     |
+| 4    |
 
 
 ```sql
@@ -2903,13 +2957,13 @@ Compute minimum of values.
 Example:
 
 
-| value   |
+| value     |
 |  -------- |
-| 0   |
-| 1   |
-| 2   |
-| 3   |
-| 4   |
+| 0     |
+| 1     |
+| 2     |
+| 3     |
+| 4    |
 
 
 ```sql
@@ -2946,13 +3000,13 @@ Compute minimum of values grouped by category key and output string. Each group
 Example:
 
 
-| value  | catagory   |
+| value    | catagory     |
 |  -------- | -------- |
-| 0  | x   |
-| 1  | y   |
-| 2  | x   |
-| 3  | y   |
-| 4  | x   |
+| 0    | x     |
+| 1    | y     |
+| 2    | x     |
+| 3    | y     |
+| 4    | x    |
 
 
 ```sql
@@ -2991,14 +3045,14 @@ Compute minimum of values matching specified condition grouped by category key a
 Example:
 
 
-| value  | condition  | catagory   |
+| value    | condition    | catagory     |
 |  -------- | -------- | -------- |
-| 0  | true  | x   |
-| 1  | false  | y   |
-| 2  | false  | x   |
-| 1  | true  | y   |
-| 4  | true  | x   |
-| 3  | true  | y   |
+| 0    | true    | x     |
+| 1    | false    | y     |
+| 2    | false    | x     |
+| 1    | true    | y     |
+| 4    | true    | x     |
+| 3    | true    | y    |
 
 
 ```sql
@@ -3040,13 +3094,13 @@ Compute minimum of values match specified condition.
 Example:
 
 
-| value   |
+| value     |
 |  -------- |
-| 0   |
-| 1   |
-| 2   |
-| 3   |
-| 4   |
+| 0     |
+| 1     |
+| 2     |
+| 3     |
+| 4    |
 
 
 ```sql
@@ -3176,12 +3230,12 @@ select col1, cond, gp, nth_value_where(col1, 2, cond) over (partition by gp orde
 ```
 
 
-| col1  | cond  | gp  | agg   |
+| col1    | cond    | gp    | agg     |
 |  -------- | -------- | -------- | -------- |
-| 1  | true  | 100  | NULL   |
-| 2  | false  | 100  | NULL   |
-| 3  | NULL  | 100  | NULL   |
-| 4  | true  | 100  | 4   |
+| 1    | true    | 100    | NULL     |
+| 2    | false    | 100    | NULL     |
+| 3    | NULL    | 100    | NULL     |
+| 4    | true    | 100    | 4    |
 
 
 
@@ -3810,12 +3864,12 @@ Alias function: `std`, `stddev_samp`
 Example:
 
 
-| value   |
+| value     |
 |  -------- |
-| 1   |
-| 2   |
-| 3   |
-| 4   |
+| 1     |
+| 2     |
+| 3     |
+| 4    |
 
 
 ```sql
@@ -3852,12 +3906,12 @@ Compute population standard deviation of values, i.e., `sqrt( sum((x_i - avg)^2)
 Example:
 
 
-| value   |
+| value     |
 |  -------- |
-| 1   |
-| 2   |
-| 3   |
-| 4   |
+| 1     |
+| 2     |
+| 3     |
+| 4    |
 
 
 ```sql
@@ -4013,13 +4067,13 @@ Compute sum of values.
 Example:
 
 
-| value   |
+| value     |
 |  -------- |
-| 0   |
-| 1   |
-| 2   |
-| 3   |
-| 4   |
+| 0     |
+| 1     |
+| 2     |
+| 3     |
+| 4    |
 
 
 ```sql
@@ -4053,13 +4107,13 @@ Compute sum of values grouped by category key and output string. Each group is r
 Example:
 
 
-| value  | catagory   |
+| value    | catagory     |
 |  -------- | -------- |
-| 0  | x   |
-| 1  | y   |
-| 2  | x   |
-| 3  | y   |
-| 4  | x   |
+| 0    | x     |
+| 1    | y     |
+| 2    | x     |
+| 3    | y     |
+| 4    | x    |
 
 
 ```sql
@@ -4098,13 +4152,13 @@ Compute sum of values matching specified condition grouped by category key and o
 Example:
 
 
-| value  | condition  | catagory   |
+| value    | condition    | catagory     |
 |  -------- | -------- | -------- |
-| 0  | true  | x   |
-| 1  | false  | y   |
-| 2  | false  | x   |
-| 3  | true  | y   |
-| 4  | true  | x   |
+| 0    | true    | x     |
+| 1    | false    | y     |
+| 2    | false    | x     |
+| 3    | true    | y     |
+| 4    | true    | x    |
 
 
 ```sql
@@ -4146,13 +4200,13 @@ Compute sum of values match specified condition.
 Example:
 
 
-| value   |
+| value     |
 |  -------- |
-| 0   |
-| 1   |
-| 2   |
-| 3   |
-| 4   |
+| 0     |
+| 1     |
+| 2     |
+| 3     |
+| 4    |
 
 
 ```sql
@@ -4262,13 +4316,13 @@ Compute top k of values and output string separated by comma. The outputs are so
 Example:
 
 
-| value   |
+| value     |
 |  -------- |
-| 1   |
-| 2   |
-| 3   |
-| 4   |
-| 4   |
+| 1     |
+| 2     |
+| 3     |
+| 4     |
+| 4    |
 
 
 ```sql
@@ -4319,11 +4373,11 @@ SELECT key, top1_ratio(key) over () as ratio FROM t1;
 ```
 
 
-| key  | ratio   |
+| key    | ratio     |
 |  -------- | -------- |
-| 1  | 1.0   |
-| 2  | 0.5   |
-| NULL  | 0.5   |
+| 1    | 1.0     |
+| 2    | 0.5     |
+| NULL    | 0.5    |
 
 
 
@@ -4360,15 +4414,15 @@ Compute average of values matching specified condition grouped by category key.
 Example:
 
 
-| value  | condition  | catagory   |
+| value    | condition    | catagory     |
 |  -------- | -------- | -------- |
-| 0  | true  | x   |
-| 1  | false  | y   |
-| 2  | false  | x   |
-| 3  | true  | y   |
-| 4  | true  | x   |
-| 5  | true  | z   |
-| 6  | false  | z   |
+| 0    | true    | x     |
+| 1    | false    | y     |
+| 2    | false    | x     |
+| 3    | true    | y     |
+| 4    | true    | x     |
+| 5    | true    | z     |
+| 6    | false    | z    |
 
 
 ```sql
@@ -4420,15 +4474,15 @@ Compute count of values matching specified condition grouped by category key. Ou
 Example:
 
 
-| value  | condition  | catagory   |
+| value    | condition    | catagory     |
 |  -------- | -------- | -------- |
-| 0  | true  | x   |
-| 1  | true  | y   |
-| 2  | false  | x   |
-| 3  | true  | y   |
-| 4  | false  | x   |
-| 5  | true  | z   |
-| 6  | true  | z   |
+| 0    | true    | x     |
+| 1    | true    | y     |
+| 2    | false    | x     |
+| 3    | true    | y     |
+| 4    | false    | x     |
+| 5    | true    | z     |
+| 6    | true    | z    |
 
 
 ```sql
@@ -4480,15 +4534,15 @@ Compute maximum of values matching specified condition grouped by category key.
 Example:
 
 
-| value  | condition  | catagory   |
+| value    | condition    | catagory     |
 |  -------- | -------- | -------- |
-| 0  | true  | x   |
-| 1  | false  | y   |
-| 2  | false  | x   |
-| 3  | true  | y   |
-| 4  | true  | x   |
-| 5  | true  | z   |
-| 6  | false  | z   |
+| 0    | true    | x     |
+| 1    | false    | y     |
+| 2    | false    | x     |
+| 3    | true    | y     |
+| 4    | true    | x     |
+| 5    | true    | z     |
+| 6    | false    | z    |
 
 
 ```sql
@@ -4540,15 +4594,15 @@ Compute minimum of values matching specified condition grouped by category key.
 Example:
 
 
-| value  | condition  | catagory   |
+| value    | condition    | catagory     |
 |  -------- | -------- | -------- |
-| 0  | true  | x   |
-| 1  | true  | y   |
-| 2  | false  | x   |
-| 3  | true  | y   |
-| 4  | false  | x   |
-| 5  | true  | z   |
-| 6  | true  | z   |
+| 0    | true    | x     |
+| 1    | true    | y     |
+| 2    | false    | x     |
+| 3    | true    | y     |
+| 4    | false    | x     |
+| 5    | true    | z     |
+| 6    | true    | z    |
 
 
 ```sql
@@ -4602,15 +4656,15 @@ For each group, ratio value is `value` expr count matches condtion divide total
 Example:
 
 
-| value  | condition  | catagory   |
+| value    | condition    | catagory     |
 |  -------- | -------- | -------- |
-| 0  | true  | x   |
-| 2  | true  | x   |
-| 4  | true  | x   |
-| 1  | true  | y   |
-| 3  | false  | y   |
-| 5  | true  | z   |
-| 6  | true  | z   |
+| 0    | true    | x     |
+| 2    | true    | x     |
+| 4    | true    | x     |
+| 1    | true    | y     |
+| 3    | false    | y     |
+| 5    | true    | z     |
+| 6    | true    | z    |
 
 
 ```sql
@@ -4661,15 +4715,15 @@ Compute sum of values matching specified condition grouped by category key. Outp
 Example:
 
 
-| value  | condition  | catagory   |
+| value    | condition    | catagory     |
 |  -------- | -------- | -------- |
-| 0  | true  | x   |
-| 1  | true  | y   |
-| 2  | false  | x   |
-| 3  | true  | y   |
-| 4  | false  | x   |
-| 5  | true  | z   |
-| 6  | true  | z   |
+| 0    | true    | x     |
+| 1    | true    | y     |
+| 2    | false    | x     |
+| 3    | true    | y     |
+| 4    | false    | x     |
+| 5    | true    | z     |
+| 6    | true    | z    |
 
 
 ```sql
@@ -4721,15 +4775,15 @@ Compute average of values matching specified condition grouped by category key.
 Example:
 
 
-| value  | condition  | catagory   |
+| value    | condition    | catagory     |
 |  -------- | -------- | -------- |
-| 0  | true  | x   |
-| 1  | false  | y   |
-| 2  | false  | x   |
-| 3  | false  | y   |
-| 4  | true  | x   |
-| 5  | true  | z   |
-| 6  | false  | z   |
+| 0    | true    | x     |
+| 1    | false    | y     |
+| 2    | false    | x     |
+| 3    | false    | y     |
+| 4    | true    | x     |
+| 5    | true    | z     |
+| 6    | false    | z    |
 
 
 ```sql
@@ -4781,15 +4835,15 @@ Compute count of values matching specified condition grouped by category key. Ou
 Example:
 
 
-| value  | condition  | catagory   |
+| value    | condition    | catagory     |
 |  -------- | -------- | -------- |
-| 0  | true  | x   |
-| 1  | true  | y   |
-| 2  | true  | x   |
-| 3  | false  | y   |
-| 4  | true  | x   |
-| 5  | true  | z   |
-| 6  | true  | z   |
+| 0    | true    | x     |
+| 1    | true    | y     |
+| 2    | true    | x     |
+| 3    | false    | y     |
+| 4    | true    | x     |
+| 5    | true    | z     |
+| 6    | true    | z    |
 
 
 ```sql
@@ -4841,15 +4895,15 @@ Compute maximum of values matching specified condition grouped by category key.
 Example:
 
 
-| value  | condition  | catagory   |
+| value    | condition    | catagory     |
 |  -------- | -------- | -------- |
-| 0  | true  | x   |
-| 1  | false  | y   |
-| 2  | false  | x   |
-| 3  | true  | y   |
-| 4  | true  | x   |
-| 5  | true  | z   |
-| 6  | false  | z   |
+| 0    | true    | x     |
+| 1    | false    | y     |
+| 2    | false    | x     |
+| 3    | true    | y     |
+| 4    | true    | x     |
+| 5    | true    | z     |
+| 6    | false    | z    |
 
 
 ```sql
@@ -4901,15 +4955,15 @@ Compute minimum of values matching specified condition grouped by category key.
 Example:
 
 
-| value  | condition  | catagory   |
+| value    | condition    | catagory     |
 |  -------- | -------- | -------- |
-| 0  | true  | x   |
-| 1  | true  | y   |
-| 2  | true  | x   |
-| 3  | true  | y   |
-| 4  | false  | x   |
-| 5  | true  | z   |
-| 6  | true  | z   |
+| 0    | true    | x     |
+| 1    | true    | y     |
+| 2    | true    | x     |
+| 3    | true    | y     |
+| 4    | false    | x     |
+| 5    | true    | z     |
+| 6    | true    | z    |
 
 
 ```sql
@@ -4963,15 +5017,15 @@ For each group, ratio value is `value` expr count matches condtion divide total
 Example:
 
 
-| value  | condition  | catagory   |
+| value    | condition    | catagory     |
 |  -------- | -------- | -------- |
-| 0  | true  | x   |
-| 2  | true  | x   |
-| 4  | true  | x   |
-| 1  | true  | y   |
-| 3  | false  | y   |
-| 5  | true  | z   |
-| 6  | true  | z   |
+| 0    | true    | x     |
+| 2    | true    | x     |
+| 4    | true    | x     |
+| 1    | true    | y     |
+| 3    | false    | y     |
+| 5    | true    | z     |
+| 6    | true    | z    |
 
 
 ```sql
@@ -5022,15 +5076,15 @@ Compute sum of values matching specified condition grouped by category key. Outp
 Example:
 
 
-| value  | condition  | catagory   |
+| value    | condition    | catagory     |
 |  -------- | -------- | -------- |
-| 0  | true  | x   |
-| 1  | true  | y   |
-| 2  | false  | x   |
-| 3  | false  | y   |
-| 4  | true  | x   |
-| 5  | true  | z   |
-| 6  | true  | z   |
+| 0    | true    | x     |
+| 1    | true    | y     |
+| 2    | false    | x     |
+| 3    | false    | y     |
+| 4    | true    | x     |
+| 5    | true    | z     |
+| 6    | true    | z    |
 
 
 ```sql
@@ -5245,11 +5299,11 @@ Compute population variance of values, i.e., `sum((x_i - avg)^2) / n`
 Example:
 
 
-| value   |
+| value     |
 |  -------- |
-| 0   |
-| 3   |
-| 6   |
+| 0     |
+| 3     |
+| 6    |
 
 
 ```sql
@@ -5286,11 +5340,11 @@ Compute population variance of values, i.e., `sum((x_i - avg)^2) / (n-1)`
 Example:
 
 
-| value   |
+| value     |
 |  -------- |
-| 0   |
-| 3   |
-| 6   |
+| 0     |
+| 3     |
+| 6    |
 
 
 ```sql
diff --git a/docs/zh/openmldb_sql/udfs_8h.md b/docs/zh/openmldb_sql/udfs_8h.md
index 9cfab05977f..9fc3d807470 100644
--- a/docs/zh/openmldb_sql/udfs_8h.md
+++ b/docs/zh/openmldb_sql/udfs_8h.md
@@ -86,6 +86,8 @@ title: udfs/udfs.h
 | **[log2](/openmldb_sql/Files/udfs_8h.md#function-log2)**()| <br>Return the base-2 logarithm of expr. |
 | **[lower](/openmldb_sql/Files/udfs_8h.md#function-lower)**()| |
 | **[make_tuple](/openmldb_sql/Files/udfs_8h.md#function-make-tuple)**()| |
+| **[map](/openmldb_sql/Files/udfs_8h.md#function-map)**()| <br>map(key1, value1, key2, value2, ...) - Creates a map with the given key/value pairs. |
+| **[map_keys](/openmldb_sql/Files/udfs_8h.md#function-map-keys)**()| <br>map_keys(map) - Returns an unordered array containing the keys of the map. |
 | **[max](/openmldb_sql/Files/udfs_8h.md#function-max)**()| <br>Compute maximum of values. |
 | **[max_cate](/openmldb_sql/Files/udfs_8h.md#function-max-cate)**()| <br>Compute maximum of values grouped by category key and output string. Each group is represented as 'K:V' and separated by comma in outputs and are sorted by key in ascend order. |
 | **[max_cate_where](/openmldb_sql/Files/udfs_8h.md#function-max-cate-where)**()| <br>Compute maximum of values matching specified condition grouped by category key and output string. Each group is represented as 'K:V' and separated by comma in outputs and are sorted by key in ascend order. |
@@ -501,13 +503,13 @@ Compute average of values.
 Example:
 
 
-| value   |
+| value     |
 |  -------- |
-| 0   |
-| 1   |
-| 2   |
-| 3   |
-| 4   |
+| 0     |
+| 1     |
+| 2     |
+| 3     |
+| 4    |
 
 
 ```sql
@@ -541,13 +543,13 @@ Compute average of values grouped by category key and output string. Each group
 Example:
 
 
-| value  | catagory   |
+| value    | catagory     |
 |  -------- | -------- |
-| 0  | x   |
-| 1  | y   |
-| 2  | x   |
-| 3  | y   |
-| 4  | x   |
+| 0    | x     |
+| 1    | y     |
+| 2    | x     |
+| 3    | y     |
+| 4    | x    |
 
 
 ```sql
@@ -586,13 +588,13 @@ Compute average of values matching specified condition grouped by category key a
 Example:
 
 
-| value  | condition  | catagory   |
+| value    | condition    | catagory     |
 |  -------- | -------- | -------- |
-| 0  | true  | x   |
-| 1  | false  | y   |
-| 2  | false  | x   |
-| 3  | true  | y   |
-| 4  | true  | x   |
+| 0    | true    | x     |
+| 1    | false    | y     |
+| 2    | false    | x     |
+| 3    | true    | y     |
+| 4    | true    | x    |
 
 
 ```sql
@@ -634,13 +636,13 @@ Compute average of values match specified condition.
 Example:
 
 
-| value   |
+| value     |
 |  -------- |
-| 0   |
-| 1   |
-| 2   |
-| 3   |
-| 4   |
+| 0     |
+| 1     |
+| 2     |
+| 3     |
+| 4    |
 
 
 ```sql
@@ -946,13 +948,13 @@ Compute number of values.
 Example:
 
 
-| value   |
+| value     |
 |  -------- |
-| 0   |
-| 1   |
-| 2   |
-| 3   |
-| 4   |
+| 0     |
+| 1     |
+| 2     |
+| 3     |
+| 4    |
 
 
 ```sql
@@ -987,13 +989,13 @@ Compute count of values grouped by category key and output string. Each group is
 Example:
 
 
-| value  | catagory   |
+| value    | catagory     |
 |  -------- | -------- |
-| 0  | x   |
-| 1  | y   |
-| 2  | x   |
-| 3  | y   |
-| 4  | x   |
+| 0    | x     |
+| 1    | y     |
+| 2    | x     |
+| 3    | y     |
+| 4    | x    |
 
 
 ```sql
@@ -1032,13 +1034,13 @@ Compute count of values matching specified condition grouped by category key and
 Example:
 
 
-| value  | condition  | catagory   |
+| value    | condition    | catagory     |
 |  -------- | -------- | -------- |
-| 0  | true  | x   |
-| 1  | false  | y   |
-| 2  | false  | x   |
-| 3  | true  | y   |
-| 4  | true  | x   |
+| 0    | true    | x     |
+| 1    | false    | y     |
+| 2    | false    | x     |
+| 3    | true    | y     |
+| 4    | true    | x    |
 
 
 ```sql
@@ -1080,13 +1082,13 @@ Compute number of values match specified condition.
 Example:
 
 
-| value   |
+| value     |
 |  -------- |
-| 0   |
-| 1   |
-| 2   |
-| 3   |
-| 4   |
+| 0     |
+| 1     |
+| 2     |
+| 3     |
+| 4    |
 
 
 ```sql
@@ -1374,13 +1376,13 @@ Compute number of distinct values.
 Example:
 
 
-| value   |
+| value     |
 |  -------- |
-| 0   |
-| 0   |
-| 2   |
-| 2   |
-| 4   |
+| 0     |
+| 0     |
+| 2     |
+| 2     |
+| 4    |
 
 
 ```sql
@@ -1450,14 +1452,14 @@ It requires that all values are non-negative. Negative values will be ignored.
 Example:
 
 
-| value   |
+| value     |
 |  -------- |
-| 1   |
-| 8   |
-| 5   |
-| 2   |
-| 10   |
-| 4   |
+| 1     |
+| 8     |
+| 5     |
+| 2     |
+| 10     |
+| 4    |
 
 
 ```sql
@@ -1568,13 +1570,13 @@ It requires that values are ordered so that it can only be used with WINDOW (PAR
 Example:
 
 
-| value   |
+| value     |
 |  -------- |
-| 0   |
-| 1   |
-| 2   |
-| 3   |
-| 4   |
+| 0     |
+| 1     |
+| 2     |
+| 3     |
+| 4    |
 
 
 ```sql
@@ -1652,11 +1654,11 @@ window w as (partition by gp order by ts rows between 3 preceding and current ro
 ```
 
 
-| id  | gp  | ts  | agg   |
+| id    | gp    | ts    | agg     |
 |  -------- | -------- | -------- | -------- |
-| 1  | 100  | 98  | 98   |
-| 2  | 100  | 99  | 99   |
-| 3  | 100  | 100  | 100   |
+| 1    | 100    | 98    | 98     |
+| 2    | 100    | 99    | 99     |
+| 3    | 100    | 100    | 100    |
 
 
 
@@ -2259,13 +2261,13 @@ The offset in window is `nth_value()`, not `[lag()](/openmldb_sql/Files/udfs_8h.
 Example:
 
 
-| c1  | c2   |
+| c1    | c2     |
 |  -------- | -------- |
-| 0  | 1   |
-| 1  | 1   |
-| 2  | 2   |
-| 3  | 2   |
-| 4  | 2   |
+| 0    | 1     |
+| 1    | 1     |
+| 2    | 2     |
+| 3    | 2     |
+| 4    | 2    |
 
 
 ```sql
@@ -2630,6 +2632,58 @@ make_tuple()
 
 * [...] 
 
+### function map
+
+```cpp
+map()
+```
+
+**Description**:
+
+map(key1, value1, key2, value2, ...) - Creates a map with the given key/value pairs. 
+
+**Since**:
+0.9.0
+
+
+Example:
+
+```sql
+
+select map(1, '1', 2, '2');
+-- {1: "1", 2: "2"}
+```
+
+
+**Supported Types**:
+
+* [...] 
+
+### function map_keys
+
+```cpp
+map_keys()
+```
+
+**Description**:
+
+map_keys(map) - Returns an unordered array containing the keys of the map. 
+
+**Since**:
+0.9.0
+
+
+Example:
+
+```sql
+
+select map_keys(map(1, '2', 3, '4'));
+-- [1, 3]
+```
+
+
+**Supported Types**: 
+
 ### function max
 
 ```cpp
@@ -2653,13 +2707,13 @@ Compute maximum of values.
 Example:
 
 
-| value   |
+| value     |
 |  -------- |
-| 0   |
-| 1   |
-| 2   |
-| 3   |
-| 4   |
+| 0     |
+| 1     |
+| 2     |
+| 3     |
+| 4    |
 
 
 ```sql
@@ -2696,13 +2750,13 @@ Compute maximum of values grouped by category key and output string. Each group
 Example:
 
 
-| value  | catagory   |
+| value    | catagory     |
 |  -------- | -------- |
-| 0  | x   |
-| 1  | y   |
-| 2  | x   |
-| 3  | y   |
-| 4  | x   |
+| 0    | x     |
+| 1    | y     |
+| 2    | x     |
+| 3    | y     |
+| 4    | x    |
 
 
 ```sql
@@ -2741,13 +2795,13 @@ Compute maximum of values matching specified condition grouped by category key a
 Example:
 
 
-| value  | condition  | catagory   |
+| value    | condition    | catagory     |
 |  -------- | -------- | -------- |
-| 0  | true  | x   |
-| 1  | false  | y   |
-| 2  | false  | x   |
-| 3  | true  | y   |
-| 4  | true  | x   |
+| 0    | true    | x     |
+| 1    | false    | y     |
+| 2    | false    | x     |
+| 3    | true    | y     |
+| 4    | true    | x    |
 
 
 ```sql
@@ -2789,13 +2843,13 @@ Compute maximum of values match specified condition.
 Example:
 
 
-| value   |
+| value     |
 |  -------- |
-| 0   |
-| 1   |
-| 2   |
-| 3   |
-| 4   |
+| 0     |
+| 1     |
+| 2     |
+| 3     |
+| 4    |
 
 
 ```sql
@@ -2861,12 +2915,12 @@ Compute the median of values.
 Example:
 
 
-| value   |
+| value     |
 |  -------- |
-| 1   |
-| 2   |
-| 3   |
-| 4   |
+| 1     |
+| 2     |
+| 3     |
+| 4    |
 
 
 ```sql
@@ -2903,13 +2957,13 @@ Compute minimum of values.
 Example:
 
 
-| value   |
+| value     |
 |  -------- |
-| 0   |
-| 1   |
-| 2   |
-| 3   |
-| 4   |
+| 0     |
+| 1     |
+| 2     |
+| 3     |
+| 4    |
 
 
 ```sql
@@ -2946,13 +3000,13 @@ Compute minimum of values grouped by category key and output string. Each group
 Example:
 
 
-| value  | catagory   |
+| value    | catagory     |
 |  -------- | -------- |
-| 0  | x   |
-| 1  | y   |
-| 2  | x   |
-| 3  | y   |
-| 4  | x   |
+| 0    | x     |
+| 1    | y     |
+| 2    | x     |
+| 3    | y     |
+| 4    | x    |
 
 
 ```sql
@@ -2991,14 +3045,14 @@ Compute minimum of values matching specified condition grouped by category key a
 Example:
 
 
-| value  | condition  | catagory   |
+| value    | condition    | catagory     |
 |  -------- | -------- | -------- |
-| 0  | true  | x   |
-| 1  | false  | y   |
-| 2  | false  | x   |
-| 1  | true  | y   |
-| 4  | true  | x   |
-| 3  | true  | y   |
+| 0    | true    | x     |
+| 1    | false    | y     |
+| 2    | false    | x     |
+| 1    | true    | y     |
+| 4    | true    | x     |
+| 3    | true    | y    |
 
 
 ```sql
@@ -3040,13 +3094,13 @@ Compute minimum of values match specified condition.
 Example:
 
 
-| value   |
+| value     |
 |  -------- |
-| 0   |
-| 1   |
-| 2   |
-| 3   |
-| 4   |
+| 0     |
+| 1     |
+| 2     |
+| 3     |
+| 4    |
 
 
 ```sql
@@ -3176,12 +3230,12 @@ select col1, cond, gp, nth_value_where(col1, 2, cond) over (partition by gp orde
 ```
 
 
-| col1  | cond  | gp  | agg   |
+| col1    | cond    | gp    | agg     |
 |  -------- | -------- | -------- | -------- |
-| 1  | true  | 100  | NULL   |
-| 2  | false  | 100  | NULL   |
-| 3  | NULL  | 100  | NULL   |
-| 4  | true  | 100  | 4   |
+| 1    | true    | 100    | NULL     |
+| 2    | false    | 100    | NULL     |
+| 3    | NULL    | 100    | NULL     |
+| 4    | true    | 100    | 4    |
 
 
 
@@ -3810,12 +3864,12 @@ Alias function: `std`, `stddev_samp`
 Example:
 
 
-| value   |
+| value     |
 |  -------- |
-| 1   |
-| 2   |
-| 3   |
-| 4   |
+| 1     |
+| 2     |
+| 3     |
+| 4    |
 
 
 ```sql
@@ -3852,12 +3906,12 @@ Compute population standard deviation of values, i.e., `sqrt( sum((x_i - avg)^2)
 Example:
 
 
-| value   |
+| value     |
 |  -------- |
-| 1   |
-| 2   |
-| 3   |
-| 4   |
+| 1     |
+| 2     |
+| 3     |
+| 4    |
 
 
 ```sql
@@ -4013,13 +4067,13 @@ Compute sum of values.
 Example:
 
 
-| value   |
+| value     |
 |  -------- |
-| 0   |
-| 1   |
-| 2   |
-| 3   |
-| 4   |
+| 0     |
+| 1     |
+| 2     |
+| 3     |
+| 4    |
 
 
 ```sql
@@ -4053,13 +4107,13 @@ Compute sum of values grouped by category key and output string. Each group is r
 Example:
 
 
-| value  | catagory   |
+| value    | catagory     |
 |  -------- | -------- |
-| 0  | x   |
-| 1  | y   |
-| 2  | x   |
-| 3  | y   |
-| 4  | x   |
+| 0    | x     |
+| 1    | y     |
+| 2    | x     |
+| 3    | y     |
+| 4    | x    |
 
 
 ```sql
@@ -4098,13 +4152,13 @@ Compute sum of values matching specified condition grouped by category key and o
 Example:
 
 
-| value  | condition  | catagory   |
+| value    | condition    | catagory     |
 |  -------- | -------- | -------- |
-| 0  | true  | x   |
-| 1  | false  | y   |
-| 2  | false  | x   |
-| 3  | true  | y   |
-| 4  | true  | x   |
+| 0    | true    | x     |
+| 1    | false    | y     |
+| 2    | false    | x     |
+| 3    | true    | y     |
+| 4    | true    | x    |
 
 
 ```sql
@@ -4146,13 +4200,13 @@ Compute sum of values match specified condition.
 Example:
 
 
-| value   |
+| value     |
 |  -------- |
-| 0   |
-| 1   |
-| 2   |
-| 3   |
-| 4   |
+| 0     |
+| 1     |
+| 2     |
+| 3     |
+| 4    |
 
 
 ```sql
@@ -4262,13 +4316,13 @@ Compute top k of values and output string separated by comma. The outputs are so
 Example:
 
 
-| value   |
+| value     |
 |  -------- |
-| 1   |
-| 2   |
-| 3   |
-| 4   |
-| 4   |
+| 1     |
+| 2     |
+| 3     |
+| 4     |
+| 4    |
 
 
 ```sql
@@ -4319,11 +4373,11 @@ SELECT key, top1_ratio(key) over () as ratio FROM t1;
 ```
 
 
-| key  | ratio   |
+| key    | ratio     |
 |  -------- | -------- |
-| 1  | 1.0   |
-| 2  | 0.5   |
-| NULL  | 0.5   |
+| 1    | 1.0     |
+| 2    | 0.5     |
+| NULL    | 0.5    |
 
 
 
@@ -4360,15 +4414,15 @@ Compute average of values matching specified condition grouped by category key.
 Example:
 
 
-| value  | condition  | catagory   |
+| value    | condition    | catagory     |
 |  -------- | -------- | -------- |
-| 0  | true  | x   |
-| 1  | false  | y   |
-| 2  | false  | x   |
-| 3  | true  | y   |
-| 4  | true  | x   |
-| 5  | true  | z   |
-| 6  | false  | z   |
+| 0    | true    | x     |
+| 1    | false    | y     |
+| 2    | false    | x     |
+| 3    | true    | y     |
+| 4    | true    | x     |
+| 5    | true    | z     |
+| 6    | false    | z    |
 
 
 ```sql
@@ -4420,15 +4474,15 @@ Compute count of values matching specified condition grouped by category key. Ou
 Example:
 
 
-| value  | condition  | catagory   |
+| value    | condition    | catagory     |
 |  -------- | -------- | -------- |
-| 0  | true  | x   |
-| 1  | true  | y   |
-| 2  | false  | x   |
-| 3  | true  | y   |
-| 4  | false  | x   |
-| 5  | true  | z   |
-| 6  | true  | z   |
+| 0    | true    | x     |
+| 1    | true    | y     |
+| 2    | false    | x     |
+| 3    | true    | y     |
+| 4    | false    | x     |
+| 5    | true    | z     |
+| 6    | true    | z    |
 
 
 ```sql
@@ -4480,15 +4534,15 @@ Compute maximum of values matching specified condition grouped by category key.
 Example:
 
 
-| value  | condition  | catagory   |
+| value    | condition    | catagory     |
 |  -------- | -------- | -------- |
-| 0  | true  | x   |
-| 1  | false  | y   |
-| 2  | false  | x   |
-| 3  | true  | y   |
-| 4  | true  | x   |
-| 5  | true  | z   |
-| 6  | false  | z   |
+| 0    | true    | x     |
+| 1    | false    | y     |
+| 2    | false    | x     |
+| 3    | true    | y     |
+| 4    | true    | x     |
+| 5    | true    | z     |
+| 6    | false    | z    |
 
 
 ```sql
@@ -4540,15 +4594,15 @@ Compute minimum of values matching specified condition grouped by category key.
 Example:
 
 
-| value  | condition  | catagory   |
+| value    | condition    | catagory     |
 |  -------- | -------- | -------- |
-| 0  | true  | x   |
-| 1  | true  | y   |
-| 2  | false  | x   |
-| 3  | true  | y   |
-| 4  | false  | x   |
-| 5  | true  | z   |
-| 6  | true  | z   |
+| 0    | true    | x     |
+| 1    | true    | y     |
+| 2    | false    | x     |
+| 3    | true    | y     |
+| 4    | false    | x     |
+| 5    | true    | z     |
+| 6    | true    | z    |
 
 
 ```sql
@@ -4602,15 +4656,15 @@ For each group, ratio value is `value` expr count matches condtion divide total
 Example:
 
 
-| value  | condition  | catagory   |
+| value    | condition    | catagory     |
 |  -------- | -------- | -------- |
-| 0  | true  | x   |
-| 2  | true  | x   |
-| 4  | true  | x   |
-| 1  | true  | y   |
-| 3  | false  | y   |
-| 5  | true  | z   |
-| 6  | true  | z   |
+| 0    | true    | x     |
+| 2    | true    | x     |
+| 4    | true    | x     |
+| 1    | true    | y     |
+| 3    | false    | y     |
+| 5    | true    | z     |
+| 6    | true    | z    |
 
 
 ```sql
@@ -4661,15 +4715,15 @@ Compute sum of values matching specified condition grouped by category key. Outp
 Example:
 
 
-| value  | condition  | catagory   |
+| value    | condition    | catagory     |
 |  -------- | -------- | -------- |
-| 0  | true  | x   |
-| 1  | true  | y   |
-| 2  | false  | x   |
-| 3  | true  | y   |
-| 4  | false  | x   |
-| 5  | true  | z   |
-| 6  | true  | z   |
+| 0    | true    | x     |
+| 1    | true    | y     |
+| 2    | false    | x     |
+| 3    | true    | y     |
+| 4    | false    | x     |
+| 5    | true    | z     |
+| 6    | true    | z    |
 
 
 ```sql
@@ -4721,15 +4775,15 @@ Compute average of values matching specified condition grouped by category key.
 Example:
 
 
-| value  | condition  | catagory   |
+| value    | condition    | catagory     |
 |  -------- | -------- | -------- |
-| 0  | true  | x   |
-| 1  | false  | y   |
-| 2  | false  | x   |
-| 3  | false  | y   |
-| 4  | true  | x   |
-| 5  | true  | z   |
-| 6  | false  | z   |
+| 0    | true    | x     |
+| 1    | false    | y     |
+| 2    | false    | x     |
+| 3    | false    | y     |
+| 4    | true    | x     |
+| 5    | true    | z     |
+| 6    | false    | z    |
 
 
 ```sql
@@ -4781,15 +4835,15 @@ Compute count of values matching specified condition grouped by category key. Ou
 Example:
 
 
-| value  | condition  | catagory   |
+| value    | condition    | catagory     |
 |  -------- | -------- | -------- |
-| 0  | true  | x   |
-| 1  | true  | y   |
-| 2  | true  | x   |
-| 3  | false  | y   |
-| 4  | true  | x   |
-| 5  | true  | z   |
-| 6  | true  | z   |
+| 0    | true    | x     |
+| 1    | true    | y     |
+| 2    | true    | x     |
+| 3    | false    | y     |
+| 4    | true    | x     |
+| 5    | true    | z     |
+| 6    | true    | z    |
 
 
 ```sql
@@ -4841,15 +4895,15 @@ Compute maximum of values matching specified condition grouped by category key.
 Example:
 
 
-| value  | condition  | catagory   |
+| value    | condition    | catagory     |
 |  -------- | -------- | -------- |
-| 0  | true  | x   |
-| 1  | false  | y   |
-| 2  | false  | x   |
-| 3  | true  | y   |
-| 4  | true  | x   |
-| 5  | true  | z   |
-| 6  | false  | z   |
+| 0    | true    | x     |
+| 1    | false    | y     |
+| 2    | false    | x     |
+| 3    | true    | y     |
+| 4    | true    | x     |
+| 5    | true    | z     |
+| 6    | false    | z    |
 
 
 ```sql
@@ -4901,15 +4955,15 @@ Compute minimum of values matching specified condition grouped by category key.
 Example:
 
 
-| value  | condition  | catagory   |
+| value    | condition    | catagory     |
 |  -------- | -------- | -------- |
-| 0  | true  | x   |
-| 1  | true  | y   |
-| 2  | true  | x   |
-| 3  | true  | y   |
-| 4  | false  | x   |
-| 5  | true  | z   |
-| 6  | true  | z   |
+| 0    | true    | x     |
+| 1    | true    | y     |
+| 2    | true    | x     |
+| 3    | true    | y     |
+| 4    | false    | x     |
+| 5    | true    | z     |
+| 6    | true    | z    |
 
 
 ```sql
@@ -4963,15 +5017,15 @@ For each group, ratio value is `value` expr count matches condtion divide total
 Example:
 
 
-| value  | condition  | catagory   |
+| value    | condition    | catagory     |
 |  -------- | -------- | -------- |
-| 0  | true  | x   |
-| 2  | true  | x   |
-| 4  | true  | x   |
-| 1  | true  | y   |
-| 3  | false  | y   |
-| 5  | true  | z   |
-| 6  | true  | z   |
+| 0    | true    | x     |
+| 2    | true    | x     |
+| 4    | true    | x     |
+| 1    | true    | y     |
+| 3    | false    | y     |
+| 5    | true    | z     |
+| 6    | true    | z    |
 
 
 ```sql
@@ -5022,15 +5076,15 @@ Compute sum of values matching specified condition grouped by category key. Outp
 Example:
 
 
-| value  | condition  | catagory   |
+| value    | condition    | catagory     |
 |  -------- | -------- | -------- |
-| 0  | true  | x   |
-| 1  | true  | y   |
-| 2  | false  | x   |
-| 3  | false  | y   |
-| 4  | true  | x   |
-| 5  | true  | z   |
-| 6  | true  | z   |
+| 0    | true    | x     |
+| 1    | true    | y     |
+| 2    | false    | x     |
+| 3    | false    | y     |
+| 4    | true    | x     |
+| 5    | true    | z     |
+| 6    | true    | z    |
 
 
 ```sql
@@ -5245,11 +5299,11 @@ Compute population variance of values, i.e., `sum((x_i - avg)^2) / n`
 Example:
 
 
-| value   |
+| value     |
 |  -------- |
-| 0   |
-| 3   |
-| 6   |
+| 0     |
+| 3     |
+| 6    |
 
 
 ```sql
@@ -5286,11 +5340,11 @@ Compute population variance of values, i.e., `sum((x_i - avg)^2) / (n-1)`
 Example:
 
 
-| value   |
+| value     |
 |  -------- |
-| 0   |
-| 3   |
-| 6   |
+| 0     |
+| 3     |
+| 6    |
 
 
 ```sql