YQL-20307: Support inline subqueries

- Alter grammar to support inline subqueries.
- Support inline subqueries in `sql/v1` (translator).
- Introduce `sql/v1/proto_ast/parse_tree.h` for reusable parse tree predicates.
- Support inline subqueries in `sql/v1/format`.
- Support inline subqueries in `sql/v1/complete`.
- Add some SQL-tests.
- Pass all tests.
commit_hash:075b2240778d071e1c7542f912d3cc83019ef849

1 files changed, 17 insertions, 0 deletions

diff --git a/yql/essentials/sql/v1/proto_parser/parse_tree.h b/yql/essentials/sql/v1/proto_parser/parse_tree.h
new file mode 100644
index 00000000000..74936d90466
--- /dev/null
+++ b/yql/essentials/sql/v1/proto_parser/parse_tree.h
@@ -0,0 +1,17 @@
+#pragma once
+
+#include <yql/essentials/parser/proto_ast/gen/v1_proto_split/SQLv1Parser.pb.main.h>
+
+namespace NSQLTranslationV1 {
+
+    using namespace NSQLv1Generated;
+
+    const TRule_tuple_or_expr* GetTupleOrExpr(const TRule_smart_parenthesis& msg);
+
+    bool IsSelect(const TRule_smart_parenthesis& msg);
+
+    bool IsSelect(const TRule_expr& msg);
+
+    bool IsOnlySubExpr(const TRule_select_subexpr& msg);
+
+} // namespace NSQLTranslationV1