add e2e test case

Signed-off-by: Joob1n <1208247864@qq.com>

Author: Joob1n

test/sql/test_like_escape_backslash/R/test_like_escape_backslash

@@ -2,7 +2,6 @@
 DROP TABLE IF EXISTS t_like_escape;
 -- result:
 -- !result
-
 CREATE TABLE IF NOT EXISTS t_like_escape (
     c0 INT NOT NULL,
     c1 VARCHAR(200) NOT NULL
@@ -12,7 +11,6 @@ DISTRIBUTED BY HASH(c0) BUCKETS 1
 PROPERTIES ("replication_num" = "1");
 -- result:
 -- !result
-
 INSERT INTO t_like_escape (c0, c1) VALUES
 (1, 'abc'),
 (2, 'abc\\def'),
@@ -25,7 +23,6 @@ INSERT INTO t_like_escape (c0, c1) VALUES
 (9, 'abc_def');
 -- result:
 -- !result
-
 SELECT c0, c1 FROM t_like_escape WHERE c1 LIKE '%\\\\%' ORDER BY c0;
 -- result:
 2	abc\def
@@ -34,29 +31,24 @@ SELECT c0, c1 FROM t_like_escape WHERE c1 LIKE '%\\\\%' ORDER BY c0;
 7	test\asdf
 8	star\test
 -- !result
-
 SELECT c0, c1 FROM t_like_escape WHERE c1 LIKE '%\\\\asdf' ORDER BY c0;
 -- result:
 6	\asdf
 7	test\asdf
 -- !result
-
 SELECT c0, c1 FROM t_like_escape WHERE c1 LIKE 'star\\\\%' ORDER BY c0;
 -- result:
 3	star\
 8	star\test
 -- !result
-
 SELECT c0, c1 FROM t_like_escape WHERE c1 LIKE 'star\\\\' ORDER BY c0;
 -- result:
 3	star\
 -- !result
-
 SELECT c0, c1 FROM t_like_escape WHERE c1 LIKE 'star\\%' ORDER BY c0;
 -- result:
 4	star%
 -- !result
-
 SELECT c0, c1 FROM t_like_escape WHERE like(c1, '%\\\\%') ORDER BY c0;
 -- result:
 2	abc\def
@@ -65,12 +57,10 @@ SELECT c0, c1 FROM t_like_escape WHERE like(c1, '%\\\\%') ORDER BY c0;
 7	test\asdf
 8	star\test
 -- !result
-
 SELECT c0, c1 FROM t_like_escape WHERE like(c1, 'star\\\\') ORDER BY c0;
 -- result:
 3	star\
 -- !result
-
 SELECT c0, c1 FROM t_like_escape WHERE c1 LIKE '%\\\\%' OR c1 LIKE 'star%' ORDER BY c0;
 -- result:
 2	abc\def
@@ -81,12 +71,74 @@ SELECT c0, c1 FROM t_like_escape WHERE c1 LIKE '%\\\\%' OR c1 LIKE 'star%' ORDER
 7	test\asdf
 8	star\test
 -- !result
-
 SELECT c0, c1 FROM t_like_escape WHERE c1 LIKE 'abc\\_def' ORDER BY c0;
 -- result:
 9	abc_def
 -- !result
-
 DROP TABLE t_like_escape;
 -- result:
 -- !result
+SELECT 'a\\b' LIKE 'a\\\\b';
+-- result:
+1
+-- !result
+SELECT 'a\\b' LIKE 'a\\b';
+-- result:
+0
+-- !result
+SELECT '100%' LIKE '100\\%';
+-- result:
+1
+-- !result
+SELECT '100abc' LIKE '100\\%';
+-- result:
+0
+-- !result
+SELECT 'a_b' LIKE 'a\\_b';
+-- result:
+1
+-- !result
+SELECT 'aXb' LIKE 'a\\_b';
+-- result:
+0
+-- !result
+SELECT 'abc%xyz' LIKE 'abc\\%%';
+-- result:
+1
+-- !result
+SELECT 'abcXyz' LIKE 'abc\\%%';
+-- result:
+0
+-- !result
+SELECT 'xyz%abc' LIKE '%\\%abc';
+-- result:
+1
+-- !result
+SELECT 'xa%by' LIKE '%a\\%b%';
+-- result:
+1
+-- !result
+SELECT 'xaXby' LIKE '%a\\%b%';
+-- result:
+0
+-- !result
+SELECT 'a\\xyz' LIKE 'a\\\\%';
+-- result:
+1
+-- !result
+SELECT 'abc\\' LIKE 'abc\\\\';
+-- result:
+1
+-- !result
+SELECT 'abcdef' LIKE 'abc%';
+-- result:
+1
+-- !result
+SELECT 'xyzabc' LIKE '%abc';
+-- result:
+1
+-- !result
+SELECT 'xyzabcdef' LIKE '%abc%';
+-- result:
+1
+-- !result

test/sql/test_like_escape_backslash/T/test_like_escape_backslash

@@ -49,3 +49,35 @@ SELECT c0, c1 FROM t_like_escape WHERE c1 LIKE '%\\\\%' OR c1 LIKE 'star%' ORDER
 SELECT c0, c1 FROM t_like_escape WHERE c1 LIKE 'abc\\_def' ORDER BY c0;
 
 DROP TABLE t_like_escape;
+
+-- ============================================================================
+-- Constant LIKE constant: both sides literal -> folded in FE (FoldConstantsRule).
+-- These exercise the FE constant-folding path (the buggy path), unlike the column
+-- cases above which run on BE. Results must match MySQL.
+-- ============================================================================
+
+-- C1: two-layer escaping regression ('a\b' LIKE 'a\\b' -> 1 ; 'a\b' LIKE 'a\b' -> 0)
+SELECT 'a\\b' LIKE 'a\\\\b';
+SELECT 'a\\b' LIKE 'a\\b';
+
+-- C2: escaped wildcard treated as literal
+SELECT '100%' LIKE '100\\%';
+SELECT '100abc' LIKE '100\\%';
+SELECT 'a_b' LIKE 'a\\_b';
+SELECT 'aXb' LIKE 'a\\_b';
+
+-- C3: escaped wildcard directly adjacent to a real wildcard (stripEnd boundary bug)
+SELECT 'abc%xyz' LIKE 'abc\\%%';
+SELECT 'abcXyz' LIKE 'abc\\%%';
+SELECT 'xyz%abc' LIKE '%\\%abc';
+SELECT 'xa%by' LIKE '%a\\%b%';
+SELECT 'xaXby' LIKE '%a\\%b%';
+
+-- C4: double backslash + wildcard / trailing escaped backslash
+SELECT 'a\\xyz' LIKE 'a\\\\%';
+SELECT 'abc\\' LIKE 'abc\\\\';
+
+-- C5: plain prefix/suffix/substring wildcards (no escape) still fold correctly
+SELECT 'abcdef' LIKE 'abc%';
+SELECT 'xyzabc' LIKE '%abc';
+SELECT 'xyzabcdef' LIKE '%abc%';