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fix: don't forget DISTINCT for derived tables #15672

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merged 1 commit into from
Apr 8, 2024
Merged

fix: don't forget DISTINCT for derived tables #15672

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1 change: 1 addition & 0 deletions go/vt/vtgate/planbuilder/operators/SQL_builder.go
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Original file line number Diff line number Diff line change
Expand Up @@ -603,6 +603,7 @@ func buildDerivedSelect(op *Horizon, qb *queryBuilder, sel *sqlparser.Select) {
sel.GroupBy = opQuery.GroupBy
sel.Having = mergeHaving(sel.Having, opQuery.Having)
sel.SelectExprs = opQuery.SelectExprs
sel.Distinct = opQuery.Distinct
qb.addTableExpr(op.Alias, op.Alias, TableID(op), &sqlparser.DerivedTable{
Select: sel,
}, nil, op.ColumnAliases)
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22 changes: 22 additions & 0 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 @@ -409,6 +409,28 @@
]
}
},
{
"comment": "DISTINCT inside derived table",
"query": "select * from (select distinct name from user) as t",
"plan": {
"QueryType": "SELECT",
"Original": "select * from (select distinct name from user) as t",
"Instructions": {
"OperatorType": "Route",
"Variant": "Scatter",
"Keyspace": {
"Name": "user",
"Sharded": true
},
"FieldQuery": "select `name` from (select `name` from `user` where 1 != 1) as t where 1 != 1",
"Query": "select `name` from (select distinct `name` from `user`) as t",
"Table": "`user`"
},
"TablesUsed": [
"user.user"
]
}
},
{
"comment": "',' join unsharded",
"query": "select u1.a, u2.a from unsharded u1, unsharded u2",
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