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Fix aliasing in queries by keeping required projections (#15943)
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@GuptaManan100
GuptaManan100 authored May 15, 2024
1 parent 9cfd040 commit 951f273
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Showing 5 changed files with 131 additions and 83 deletions.
9 changes: 9 additions & 0 deletions go/test/endtoend/vtgate/queries/misc/misc_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -453,6 +453,15 @@ func TestStraightJoin(t *testing.T) {
require.Contains(t, fmt.Sprintf("%v", res.Rows), "t1_tbl")
}

func TestColumnAliases(t *testing.T) {
utils.SkipIfBinaryIsBelowVersion(t, 20, "vtgate")
mcmp, closer := start(t)
defer closer()

mcmp.Exec("insert into t1(id1, id2) values (0,0), (1,1)")
mcmp.ExecWithColumnCompare(`select a as k from (select count(*) as a from t1) t`)
}

func TestEnumSetVals(t *testing.T) {
utils.SkipIfBinaryIsBelowVersion(t, 20, "vtgate")

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9 changes: 2 additions & 7 deletions go/vt/vtgate/planbuilder/operator_transformers.go
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Original file line number Diff line number Diff line change
Expand Up @@ -362,7 +362,7 @@ func transformProjection(ctx *plancontext.PlanningContext, op *operators.Project
if cols, colNames := op.AllOffsets(); cols != nil {
// if all this op is doing is passing through columns from the input, we
// can use the faster SimpleProjection
return useSimpleProjection(ctx, op, cols, colNames, src)
return useSimpleProjection(cols, colNames, src)
}

ap, err := op.GetAliasedProjections()
Expand Down Expand Up @@ -407,12 +407,7 @@ func getEvalEngingeExpr(ctx *plancontext.PlanningContext, pe *operators.ProjExpr

// useSimpleProjection uses nothing at all if the output is already correct,
// or SimpleProjection when we have to reorder or truncate the columns
func useSimpleProjection(ctx *plancontext.PlanningContext, op *operators.Projection, cols []int, colNames []string, src logicalPlan) (logicalPlan, error) {
columns := op.Source.GetColumns(ctx)
if len(columns) == len(cols) && elementsMatchIndices(cols) {
// the columns are already in the right order. we don't need anything at all here
return src, nil
}
func useSimpleProjection(cols []int, colNames []string, src logicalPlan) (logicalPlan, error) {
return &simpleProjection{
logicalPlanCommon: newBuilderCommon(src),
eSimpleProj: &engine.SimpleProjection{
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63 changes: 37 additions & 26 deletions go/vt/vtgate/planbuilder/testdata/aggr_cases.json
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Original file line number Diff line number Diff line change
Expand Up @@ -3503,35 +3503,46 @@
"Count": "10",
"Inputs": [
{
"OperatorType": "Join",
"Variant": "LeftJoin",
"JoinColumnIndexes": "R:0",
"JoinVars": {
"user_id": 0
},
"TableName": "`user`_user_extra",
"OperatorType": "SimpleProjection",
"ColumnNames": [
"col"
],
"Columns": [
0
],
"Inputs": [
{
"OperatorType": "Route",
"Variant": "Scatter",
"Keyspace": {
"Name": "user",
"Sharded": true
},
"FieldQuery": "select `user`.id from `user` where 1 != 1",
"Query": "select `user`.id from `user`",
"Table": "`user`"
},
{
"OperatorType": "Route",
"Variant": "Scatter",
"Keyspace": {
"Name": "user",
"Sharded": true
"OperatorType": "Join",
"Variant": "LeftJoin",
"JoinColumnIndexes": "R:0",
"JoinVars": {
"user_id": 0
},
"FieldQuery": "select user_extra.col from user_extra where 1 != 1",
"Query": "select user_extra.col from user_extra where user_extra.id = :user_id",
"Table": "user_extra"
"TableName": "`user`_user_extra",
"Inputs": [
{
"OperatorType": "Route",
"Variant": "Scatter",
"Keyspace": {
"Name": "user",
"Sharded": true
},
"FieldQuery": "select `user`.id from `user` where 1 != 1",
"Query": "select `user`.id from `user`",
"Table": "`user`"
},
{
"OperatorType": "Route",
"Variant": "Scatter",
"Keyspace": {
"Name": "user",
"Sharded": true
},
"FieldQuery": "select user_extra.col from user_extra where 1 != 1",
"Query": "select user_extra.col from user_extra where user_extra.id = :user_id",
"Table": "user_extra"
}
]
}
]
}
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98 changes: 60 additions & 38 deletions go/vt/vtgate/planbuilder/testdata/cte_cases.json
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Original file line number Diff line number Diff line change
Expand Up @@ -272,35 +272,46 @@
"Count": "10",
"Inputs": [
{
"OperatorType": "Join",
"Variant": "LeftJoin",
"JoinColumnIndexes": "R:0",
"JoinVars": {
"user_id": 0
},
"TableName": "`user`_user_extra",
"OperatorType": "SimpleProjection",
"ColumnNames": [
"col"
],
"Columns": [
0
],
"Inputs": [
{
"OperatorType": "Route",
"Variant": "Scatter",
"Keyspace": {
"Name": "user",
"Sharded": true
"OperatorType": "Join",
"Variant": "LeftJoin",
"JoinColumnIndexes": "R:0",
"JoinVars": {
"user_id": 0
},
"FieldQuery": "select `user`.id from `user` where 1 != 1",
"Query": "select `user`.id from `user`",
"Table": "`user`"
},
{
"OperatorType": "Route",
"Variant": "Scatter",
"Keyspace": {
"Name": "user",
"Sharded": true
},
"FieldQuery": "select user_extra.col from user_extra where 1 != 1",
"Query": "select user_extra.col from user_extra where user_extra.id = :user_id",
"Table": "user_extra"
"TableName": "`user`_user_extra",
"Inputs": [
{
"OperatorType": "Route",
"Variant": "Scatter",
"Keyspace": {
"Name": "user",
"Sharded": true
},
"FieldQuery": "select `user`.id from `user` where 1 != 1",
"Query": "select `user`.id from `user`",
"Table": "`user`"
},
{
"OperatorType": "Route",
"Variant": "Scatter",
"Keyspace": {
"Name": "user",
"Sharded": true
},
"FieldQuery": "select user_extra.col from user_extra where 1 != 1",
"Query": "select user_extra.col from user_extra where user_extra.id = :user_id",
"Table": "user_extra"
}
]
}
]
}
Expand Down Expand Up @@ -1325,20 +1336,31 @@
"QueryType": "SELECT",
"Original": "with t as (select count(*) as a from user) select a as k from t",
"Instructions": {
"OperatorType": "Aggregate",
"Variant": "Scalar",
"Aggregates": "sum_count_star(0) AS a",
"OperatorType": "SimpleProjection",
"ColumnNames": [
"k"
],
"Columns": [
0
],
"Inputs": [
{
"OperatorType": "Route",
"Variant": "Scatter",
"Keyspace": {
"Name": "user",
"Sharded": true
},
"FieldQuery": "select count(*) as a from `user` where 1 != 1",
"Query": "select count(*) as a from `user`",
"Table": "`user`"
"OperatorType": "Aggregate",
"Variant": "Scalar",
"Aggregates": "sum_count_star(0) AS a",
"Inputs": [
{
"OperatorType": "Route",
"Variant": "Scatter",
"Keyspace": {
"Name": "user",
"Sharded": true
},
"FieldQuery": "select count(*) as a from `user` where 1 != 1",
"Query": "select count(*) as a from `user`",
"Table": "`user`"
}
]
}
]
},
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35 changes: 23 additions & 12 deletions go/vt/vtgate/planbuilder/testdata/from_cases.json
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Original file line number Diff line number Diff line change
Expand Up @@ -2848,20 +2848,31 @@
"QueryType": "SELECT",
"Original": "select a as k from (select count(*) as a from user) t",
"Instructions": {
"OperatorType": "Aggregate",
"Variant": "Scalar",
"Aggregates": "sum_count_star(0) AS a",
"OperatorType": "SimpleProjection",
"ColumnNames": [
"k"
],
"Columns": [
0
],
"Inputs": [
{
"OperatorType": "Route",
"Variant": "Scatter",
"Keyspace": {
"Name": "user",
"Sharded": true
},
"FieldQuery": "select count(*) as a from `user` where 1 != 1",
"Query": "select count(*) as a from `user`",
"Table": "`user`"
"OperatorType": "Aggregate",
"Variant": "Scalar",
"Aggregates": "sum_count_star(0) AS a",
"Inputs": [
{
"OperatorType": "Route",
"Variant": "Scatter",
"Keyspace": {
"Name": "user",
"Sharded": true
},
"FieldQuery": "select count(*) as a from `user` where 1 != 1",
"Query": "select count(*) as a from `user`",
"Table": "`user`"
}
]
}
]
},
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