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Support subquery expressions in types2 (#583)

This commit is contained in:
Markus Richter 2020-05-19 19:42:36 +02:00 committed by Simon Binder
parent 65f02cb22c
commit 5596c30cc7
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2 changed files with 19 additions and 0 deletions
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14
sqlparser/lib/src/analysis/types2/resolving_visitor.dart
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@ -54,6 +54,20 @@ class TypeResolver extends RecursiveVisitor<TypeExpectation, void> {
}
}
@override
void visitSubQuery(SubQuery e, TypeExpectation arg) {
final columnsOfQuery = e.select.resolvedColumns;
if (columnsOfQuery.isEmpty) {
return super.visitSubQuery(e, arg);
}
// The query should return one column only, but this is not the right place
// to lint that. Just pick any column and resolve to that.
final columnForExpr = columnsOfQuery.first;
session._addRelation(CopyTypeFrom(e, columnForExpr));
visitChildren(e, arg);
}
@override
void visitInsertStatement(InsertStatement e, TypeExpectation arg) {
if (e.withClause != null) visit(e.withClause, arg);

5
sqlparser/test/analysis/types2/resolver_test.dart
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@ -192,6 +192,11 @@ void main() {
expect(type, const ResolvedType(type: BasicType.int));
});
test('resolves subqueries', () {
final type = _resolveResultColumn('SELECT (SELECT COUNT(*) FROM demo);');
expect(type, const ResolvedType(type: BasicType.int));
});
test('infers types for dart placeholders', () {
final resolver = _obtainResolver(r'SELECT * FROM demo WHERE $pred');
final type = resolver.session.typeOf(resolver