YQL-19747: Complete columns at simple select

Added support for a columns completion at a simple select. For example, `` SELECT # FROM hahn.`home/yql/tutorial/users` `` и `` USE hahn; SELECT $ FROM `home/yql/tutorial/users` ``.
commit_hash:2254449e91255c19792a1dc521825e44dda7d63b

1 files changed, 4 insertions, 0 deletions

diff --git a/yql/essentials/sql/v1/complete/analysis/local/parser_call_stack.cpp b/yql/essentials/sql/v1/complete/analysis/local/parser_call_stack.cpp
index 9837e404bd6..8ac4ff17999 100644
--- a/yql/essentials/sql/v1/complete/analysis/local/parser_call_stack.cpp
+++ b/yql/essentials/sql/v1/complete/analysis/local/parser_call_stack.cpp
@@ -123,6 +123,10 @@ namespace NSQLComplete {
         return Contains({RULE(Cluster_expr)}, stack);
     }
 
+    bool IsLikelyColumnStack(const TParserCallStack& stack) {
+        return Contains({RULE(Result_column)}, stack);
+    }
+
     bool IsLikelyBindingStack(const TParserCallStack& stack) {
         return EndsWith({RULE(Bind_parameter), RULE(An_id_or_type)}, stack);
     }