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planner: support union statements with ctes #15312

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merged 2 commits into from
Feb 21, 2024
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planner: support union statements with ctes #15312

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912a690
planner: format union with
maxenglander Feb 21, 2024
9f2b9da
add test for sqlparser
maxenglander Feb 21, 2024
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4 changes: 4 additions & 0 deletions go/vt/sqlparser/ast_format.go
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Original file line number Diff line number Diff line change
Expand Up @@ -74,6 +74,10 @@

// Format formats the node.
func (node *Union) Format(buf *TrackedBuffer) {
if node.With != nil {
buf.astPrintf(node, "%v", node.With)

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@maxenglander Can you also add a unit test for this to the sqlparser package?

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go/vt/sqlparser/parse_test.go is a good place for this

}

if requiresParen(node.Left) {
buf.astPrintf(node, "(%v)", node.Left)
} else {
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4 changes: 4 additions & 0 deletions go/vt/sqlparser/ast_format_fast.go
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103 changes: 103 additions & 0 deletions go/vt/vtgate/planbuilder/testdata/cte_cases.json
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Expand Up @@ -1863,5 +1863,108 @@
"main.unsharded"
]
}
},
{
"comment": "WITH two common expressions against an unsharded datbase and a SELECT UNION against those expressions",
"query": "WITH `count_a` AS (SELECT COUNT(`id`) AS `num` FROM `unsharded_a`), `count_b` AS (SELECT COUNT(`id`) AS `num` FROM `unsharded_b`) SELECT 'count_a' AS `tab`, `num` FROM `count_a` UNION SELECT 'count_b' AS `tab`, `num` FROM `count_b`",
"plan": {
"QueryType": "SELECT",
"Original": "WITH `count_a` AS (SELECT COUNT(`id`) AS `num` FROM `unsharded_a`), `count_b` AS (SELECT COUNT(`id`) AS `num` FROM `unsharded_b`) SELECT 'count_a' AS `tab`, `num` FROM `count_a` UNION SELECT 'count_b' AS `tab`, `num` FROM `count_b`",
"Instructions": {
"OperatorType": "Route",
"Variant": "Unsharded",
"Keyspace": {
"Name": "main",
"Sharded": false
},
"FieldQuery": "select 'count_a' as tab, num from count_a where 1 != 1 union select 'count_b' as tab, num from count_b where 1 != 1",
"Query": "with count_a as (select count(id) as num from unsharded_a) , count_b as (select count(id) as num from unsharded_b) select 'count_a' as tab, num from count_a union select 'count_b' as tab, num from count_b",
"Table": "unsharded_a, unsharded_b"
},
"TablesUsed": [
"main.unsharded_a",
"main.unsharded_b"
]
}
},
{
"comment": "WITH two common expressions against a sharded datbase and a SELECT UNION against those expressions",
"query": "WITH `count_a` AS (SELECT COUNT(`user_id`) AS `num` FROM `user_metadata`), `count_b` AS (SELECT COUNT(`user_id`) AS `num` FROM `user_extra`) SELECT 'count_a' AS `tab`, `num` FROM `count_a` UNION SELECT 'count_b' AS `tab`, `num` FROM `count_b`",
"plan": {
"QueryType": "SELECT",
"Original": "WITH `count_a` AS (SELECT COUNT(`user_id`) AS `num` FROM `user_metadata`), `count_b` AS (SELECT COUNT(`user_id`) AS `num` FROM `user_extra`) SELECT 'count_a' AS `tab`, `num` FROM `count_a` UNION SELECT 'count_b' AS `tab`, `num` FROM `count_b`",
"Instructions": {
"OperatorType": "Distinct",
"Collations": [
"0: utf8mb4_0900_ai_ci",
"1"
],
"Inputs": [
{
"OperatorType": "Concatenate",
"Inputs": [
{
"OperatorType": "Projection",
"Expressions": [
"'count_a' as tab",
":0 as num"
],
"Inputs": [
{
"OperatorType": "Aggregate",
"Variant": "Scalar",
"Aggregates": "sum_count(0) AS num",
"Inputs": [
{
"OperatorType": "Route",
"Variant": "Scatter",
"Keyspace": {
"Name": "user",
"Sharded": true
},
"FieldQuery": "select count(user_id) as num from user_metadata where 1 != 1",
"Query": "select count(user_id) as num from user_metadata",
"Table": "user_metadata"
}
]
}
]
},
{
"OperatorType": "Projection",
"Expressions": [
"'count_b' as tab",
":0 as num"
],
"Inputs": [
{
"OperatorType": "Aggregate",
"Variant": "Scalar",
"Aggregates": "sum_count(0) AS num",
"Inputs": [
{
"OperatorType": "Route",
"Variant": "Scatter",
"Keyspace": {
"Name": "user",
"Sharded": true
},
"FieldQuery": "select count(user_id) as num from user_extra where 1 != 1",
"Query": "select count(user_id) as num from user_extra",
"Table": "user_extra"
}
]
}
]
}
]
}
]
},
"TablesUsed": [
"user.user_extra",
"user.user_metadata"
]
}
}
]
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