YQL-19747: Hack parsing when at an empty id

There was a problem with parsing a query like
`SELECT # FROM t`, as it parsed `FROM` as if it
is an expeceted column name, so we failed to parse
a table name after `FROM` and therefore can not
complete column names, while the are so useful at
this position. Also this hack improved parsing
other queries, according to changed tests.
commit_hash:f5a657022a164d1d4bbf906db4bd2ad67bbcd956

1 files changed, 6 insertions, 2 deletions

diff --git a/yql/essentials/sql/v1/complete/sql_complete_ut.cpp b/yql/essentials/sql/v1/complete/sql_complete_ut.cpp
index 5b99c6a3fe1..aa955bc2cc5 100644
--- a/yql/essentials/sql/v1/complete/sql_complete_ut.cpp
+++ b/yql/essentials/sql/v1/complete/sql_complete_ut.cpp
@@ -905,6 +905,7 @@ Y_UNIT_TEST_SUITE(SqlCompleteTests) {
         auto engine = MakeSqlCompletionEngineUT();
         {
             TVector<TCandidate> expected = {
+                {BindingName, "$udf"},
                 {HintName, "XLOCK"},
             };
             UNIT_ASSERT_VALUES_EQUAL(Complete(engine, "PROCESS my_table USING $udf(TableRows()) WITH "), expected);
@@ -1105,8 +1106,11 @@ Y_UNIT_TEST_SUITE(SqlCompleteTests) {
             };
             UNIT_ASSERT_VALUES_EQUAL(CompleteTop(2, engine, "SELECT # FROM example.`/people` AS x"), expected);
         }
-        { // It is parsed into ``` SELECT x.FROM example.`/people` AS x ```
-            TVector<TCandidate> expected = {};
+        {
+            TVector<TCandidate> expected = {
+                {ColumnName, "Age"},
+                {ColumnName, "Name"},
+            };
             UNIT_ASSERT_VALUES_EQUAL(CompleteTop(2, engine, "SELECT x.# FROM example.`/people` AS x"), expected);
         }
         {