Bug#31797: error while parsing subqueries -- WHERE is parsed as HAVING

The name resolution for correlated subqueries and HAVING clauses
failed to distinguish which of two was being performed when there 
was a reference to an outer aliased field.
Fixed by adding the condition that HAVING clause name resulotion
is being performed.


mysql-test/r/group_by.result:
  Bug#31797: Test result
mysql-test/t/group_by.test:
  Bug#31797: Test case
sql/item.cc:
  Bug#31797: 
  Corrected function comment.
  The fix, raising the error is restricted to HAVING name resolution.

1 files changed, 36 insertions, 0 deletions

diff --git a/mysql-test/r/group_by.result b/mysql-test/r/group_by.result
index 053c2901509..97c550fcab4 100644
--- a/mysql-test/r/group_by.result
+++ b/mysql-test/r/group_by.result
@@ -1113,3 +1113,39 @@ c	b
 3	1
 3	2
 DROP TABLE t1;
+CREATE TABLE t1 ( a INT, b INT );
+SELECT b c, (SELECT a FROM t1 WHERE b = c)
+FROM t1;
+c	(SELECT a FROM t1 WHERE b = c)
+SELECT b c, (SELECT a FROM t1 WHERE b = c)
+FROM t1 
+HAVING b = 10;
+c	(SELECT a FROM t1 WHERE b = c)
+SELECT MAX(b) c, (SELECT a FROM t1 WHERE b = c)
+FROM t1 
+HAVING b = 10;
+ERROR 42S22: Reference 'c' not supported (reference to group function)
+SET @old_sql_mode = @@sql_mode;
+SET @@sql_mode='ONLY_FULL_GROUP_BY';
+SELECT b c, (SELECT a FROM t1 WHERE b = c)
+FROM t1;
+c	(SELECT a FROM t1 WHERE b = c)
+SELECT b c, (SELECT a FROM t1 WHERE b = c)
+FROM t1 
+HAVING b = 10;
+ERROR 42000: non-grouping field 'b' is used in HAVING clause
+SELECT MAX(b) c, (SELECT a FROM t1 WHERE b = c)
+FROM t1 
+HAVING b = 10;
+ERROR 42S22: Reference 'c' not supported (reference to group function)
+INSERT INTO t1 VALUES (1, 1);
+SELECT b c, (SELECT a FROM t1 WHERE b = c)
+FROM t1;
+c	(SELECT a FROM t1 WHERE b = c)
+1	1
+INSERT INTO t1 VALUES (2, 1);
+SELECT b c, (SELECT a FROM t1 WHERE b = c)
+FROM t1;
+ERROR 21000: Subquery returns more than 1 row
+DROP TABLE t1;
+SET @@sql_mode = @old_sql_mode;