SCHEMA: Make expression tests more manageable (#1629)

* SCHEMA: Make expression tests more manageable

* FIX: exists() return type is int

* FIX: Expressions again

src/schema/meta/expression_tests.yaml

@@ -10,46 +10,26 @@
   result: null
 - expression: null && true
   result: null
-- expression: null || true
-  result: null
 - expression: true && null
   result: null
 - expression: false && null
   result: false
 - expression: true || null
   result: true
+- expression: null || true
+  result: true
 - expression: false || null
   result: null
 - expression: '!null'
-  result: null
-- expression: null + 1
-  result: null
-- expression: null - 1
-  result: null
-- expression: null * 1
-  result: null
-- expression: null / 1
-  result: null
-- expression: 1 + null
-  result: null
-- expression: 1 - null
-  result: null
-- expression: 1 * null
-  result: null
-- expression: 1 / null
-  result: null
-- expression: "'str1' + null"
-  result: null
-- expression: "null + 'str1'"
-  result: null
+  result: true
 - expression: intersects([], null)
-  result: null
+  result: false
 - expression: intersects(null, [])
-  result: null
+  result: false
 - expression: match(null, 'pattern')
   result: null
 - expression: match('string', null)
-  result: null
+  result: false
 - expression: substr(null, 1, 4)
   result: null
 - expression: substr('string', null, 4)
@@ -79,27 +59,19 @@
 - expression: null == 1
   result: false
 - expression: '"VolumeTiming" in null'
-  result: false
+  result: null
 - expression: exists(null, "bids-uri")
-  result: false
+  result: 0
 - expression: exists([], null)
-  result: false
-
-# Truth/falsity of final expressions
-- expression: evaluate(true)
+  result: 0
+- expression: true || sidecar.MissingValue
   result: true
-- expression: evaluate(false)
-  result: false
-- expression: evaluate(null)
-  result: false
 
 # General expressions
 - expression: 1 + 2
   result: 3
 - expression: '"cat" + "dog"'
   result: 'catdog'
-- expression: '1 + "cat"'
-  result: null
 - expression: match('string', '.*')
   result: true
 - expression: match('', '.')