Fix MDEV-8926

  modified:   storage/connect/ha_connect.cc
  modified:   storage/connect/mysql-test/connect/r/datest.result
  modified:   storage/connect/mysql-test/connect/t/datest.test

storage/connect/ha_connect.cc

@@ -2529,6 +2529,17 @@ PFIL ha_connect::CondFilter(PGLOBAL g, Item *cond)
             !(colp[i]= tdbp->ColDB(g, (PSZ)pField->field->field_name, 0)))
           return NULL;  // Column does not belong to this table
 
+				// These are not yet implemented (buggy)
+				switch (pField->field->type()) {
+				case MYSQL_TYPE_TIMESTAMP:
+				case MYSQL_TYPE_DATE:
+				case MYSQL_TYPE_TIME:
+				case MYSQL_TYPE_DATETIME:
+				case MYSQL_TYPE_YEAR:
+				case MYSQL_TYPE_NEWDATE:
+					return NULL;
+				} // endswitch type
+
         if (trace) {
           htrc("Field index=%d\n", pField->field->field_index);
           htrc("Field name=%s\n", pField->field->field_name);

storage/connect/mysql-test/connect/r/datest.result

@@ -30,3 +30,30 @@ SELECT id, TIME(tim) FROM t1 LIMIT 1;
 id	TIME(tim)
 1	09:35:08.000000
 DROP TABLE t1;
+#
+# Testing use of dates in where clause (MDEV-8926)
+#
+CREATE TABLE t1 (col1 DATE) ENGINE=CONNECT TABLE_TYPE=CSV;
+Warnings:
+Warning	1105	No file name. Table will use t1.csv
+INSERT INTO t1 VALUES('2015-01-01'),('2015-02-01'),('2015-03-01'),('2015-04-01');
+SELECT * FROM t1 WHERE col1 = '2015-02-01';
+col1
+2015-02-01
+SELECT * FROM t1 WHERE col1 > '2015-02-01';
+col1
+2015-03-01
+2015-04-01
+SELECT * FROM t1 WHERE col1 >= '2015-02-01';
+col1
+2015-02-01
+2015-03-01
+2015-04-01
+SELECT * FROM t1 WHERE col1 < '2015-02-01';
+col1
+2015-01-01
+SELECT * FROM t1 WHERE col1 <= '2015-02-01';
+col1
+2015-01-01
+2015-02-01
+DROP TABLE t1;

storage/connect/mysql-test/connect/t/datest.test

@@ -14,3 +14,15 @@ SELECT id, DAYNAME(dat) FROM t1;
 SELECT id, DAYNAME(datim) FROM t1 LIMIT 1;
 SELECT id, TIME(tim) FROM t1 LIMIT 1;
 DROP TABLE t1;
+
+--echo #
+--echo # Testing use of dates in where clause (MDEV-8926)
+--echo #
+CREATE TABLE t1 (col1 DATE) ENGINE=CONNECT TABLE_TYPE=CSV;
+INSERT INTO t1 VALUES('2015-01-01'),('2015-02-01'),('2015-03-01'),('2015-04-01');
+SELECT * FROM t1 WHERE col1 = '2015-02-01';
+SELECT * FROM t1 WHERE col1 > '2015-02-01';
+SELECT * FROM t1 WHERE col1 >= '2015-02-01';
+SELECT * FROM t1 WHERE col1 < '2015-02-01';
+SELECT * FROM t1 WHERE col1 <= '2015-02-01';
+DROP TABLE t1;