Fix "column1 LIKE column2" for columns from same table (#2776)

This WHERE part will be performed with FilterCommand, which did not had
LIKE operator implemented until now.

mysql-test/columnstore/basic/r/mcol-5418.result

@@ -0,0 +1,12 @@
+DROP DATABASE IF EXISTS mcol5418;
+CREATE DATABASE mcol5418;
+USE mcol5418;
+CREATE TABLE tcs(d1 CHAR(6), d2 CHAR(6)) ENGINE=columnstore;
+INSERT INTO tcs(d1, d2) VALUES ('a','a'), ('a', 'b');
+SELECT 'columnstore like', d1, d2 FROM tcs WHERE (d1 LIKE d2);
+columnstore like	d1	d2
+columnstore like	a	a
+SELECT 'columnstore not like', d1, d2 FROM tcs WHERE (d1 NOT LIKE d2);
+columnstore not like	d1	d2
+columnstore not like	a	b
+DROP DATABASE mcol5418;

mysql-test/columnstore/basic/t/mcol-5418.test

@@ -0,0 +1,21 @@
+# This test tests the (NOT) LIKE test in filters that is added
+# to a FilterCommand in primproc.
+# This is a very rare situation, yet somehow I managed to trigger it.
+
+--disable_warnings
+DROP DATABASE IF EXISTS mcol5418;
+--enable_warnings
+
+CREATE DATABASE mcol5418;
+
+USE mcol5418;
+
+CREATE TABLE tcs(d1 CHAR(6), d2 CHAR(6)) ENGINE=columnstore;
+
+INSERT INTO tcs(d1, d2) VALUES ('a','a'), ('a', 'b');
+
+SELECT 'columnstore like', d1, d2 FROM tcs WHERE (d1 LIKE d2);
+
+SELECT 'columnstore not like', d1, d2 FROM tcs WHERE (d1 NOT LIKE d2);
+
+DROP DATABASE mcol5418;

primitives/primproc/filtercommand.cpp

@@ -488,6 +488,10 @@ void StrFilterCmd::setCompareFunc(uint32_t columns)
 static inline bool compareString(const datatypes::Charset& cs, const utils::ConstString& s0,
                                  const utils::ConstString& s1, uint8_t fBOP)
 {
+  if (fBOP == COMPARE_LIKE || fBOP == COMPARE_NLIKE)
+  {
+    return cs.like(fBOP == COMPARE_NLIKE, s0, s1);
+  }
   int cmp = cs.strnncollsp(s0, s1);
   switch (fBOP)
   {