Unbreak index optimization for LIKE on bytea

The same code is used to handle both text and bytea, but bytea is not
collation-aware, so we shouldn't call get_collation_isdeterministic()
in that case, since that will error out with an invalid collation.

Reported-by: Jeevan Chalke <jeevan.chalke@enterprisedb.com>
Discussion: https://www.postgresql.org/message-id/flat/CAM2%2B6%3DWaf3qJ1%3DyVTUH8_yG-SC0xcBMY%2BSFLhvKKNnWNXSUDBw%40mail.gmail.com

src/backend/utils/adt/like_support.c

@@ -267,8 +267,10 @@ match_pattern_prefix(Node *leftop,
 	 * precise error messages.)  (It should be possible to support at least
 	 * Pattern_Prefix_Exact, but no point as along as the actual
 	 * pattern-matching implementations don't support it.)
+	 *
+	 * expr_coll is not set for a non-collation-aware data type such as bytea.
 	 */
-	if (!get_collation_isdeterministic(expr_coll))
+	if (expr_coll && !get_collation_isdeterministic(expr_coll))
 		return NIL;
 
 	/*

src/test/regress/expected/strings.out

@@ -1101,6 +1101,22 @@ SELECT 'jack' LIKE '%____%' AS t;
  t
 (1 row)
 
+--
+-- basic tests of LIKE with indexes
+--
+CREATE TABLE texttest (a text PRIMARY KEY, b int);
+SELECT * FROM texttest WHERE a LIKE '%1%';
+ a | b 
+---+---
+(0 rows)
+
+CREATE TABLE byteatest (a bytea PRIMARY KEY, b int);
+SELECT * FROM byteatest WHERE a LIKE '%1%';
+ a | b 
+---+---
+(0 rows)
+
+DROP TABLE texttest, byteatest;
 --
 -- test implicit type conversion
 --

src/test/regress/sql/strings.sql

@@ -323,6 +323,19 @@ SELECT 'foo' LIKE '%__' as t, 'foo' LIKE '%___' as t, 'foo' LIKE '%____' as f;
 SELECT 'jack' LIKE '%____%' AS t;
 
 
+--
+-- basic tests of LIKE with indexes
+--
+
+CREATE TABLE texttest (a text PRIMARY KEY, b int);
+SELECT * FROM texttest WHERE a LIKE '%1%';
+
+CREATE TABLE byteatest (a bytea PRIMARY KEY, b int);
+SELECT * FROM byteatest WHERE a LIKE '%1%';
+
+DROP TABLE texttest, byteatest;
+
+
 --
 -- test implicit type conversion
 --