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, 4 insertions, 0 deletions

diff --git a/yql/essentials/sql/v1/source.h b/yql/essentials/sql/v1/source.h
index 20f81135cd4..bd3a0327cb2 100644
--- a/yql/essentials/sql/v1/source.h
+++ b/yql/essentials/sql/v1/source.h
@@ -164,6 +164,8 @@ namespace NSQLTranslationV1 {
         return cloneArgs;
     }
 
+    TSourcePtr MoveOutIfSource(TNodePtr& node);
+
     struct TJoinLinkSettings {
         enum class EStrategy {
             Default,
@@ -243,6 +245,8 @@ namespace NSQLTranslationV1 {
     // Implemented in select.cpp
     TNodePtr BuildSubquery(TSourcePtr source, const TString& alias, bool inSubquery, int ensureTupleSize, TScopedStatePtr scoped);
     TNodePtr BuildSubqueryRef(TNodePtr subquery, const TString& alias, int tupleIndex = -1);
+    bool IsSubqueryRef(const TSourcePtr& source);
+
     TNodePtr BuildInvalidSubqueryRef(TPosition subqueryPos);
     TNodePtr BuildSourceNode(TPosition pos, TSourcePtr source, bool checkExist = false, bool withTables = false);
     TSourcePtr BuildMuxSource(TPosition pos, TVector<TSourcePtr>&& sources);