--- /dev/null
+CREATE EXTENSION pg_bigm;
+\pset null '(null)'
+SELECT likequery (NULL);
+ likequery
+-----------
+ (null)
+(1 row)
+
+SELECT likequery ('');
+ likequery
+-----------
+ (null)
+(1 row)
+
+SELECT likequery ('aBc023#*^&');
+ likequery
+--------------
+ %aBc023#*^&%
+(1 row)
+
+SELECT likequery ('ポスグレの全文検索');
+ likequery
+----------------------
+ %ポスグレの全文検索%
+(1 row)
+
+SELECT likequery ('\_%');
+ likequery
+-----------
+ %\\\_\%%
+(1 row)
+
+SELECT likequery ('pg_bigmは検索性能を200%向上させました。');
+ likequery
+---------------------------------------------
+ %pg\_bigmは検索性能を200\%向上させました。%
+(1 row)
+
--- /dev/null
+CREATE EXTENSION pg_bigm;
+
+\pset null '(null)'
+SELECT likequery (NULL);
+SELECT likequery ('');
+SELECT likequery ('aBc023#*^&');
+SELECT likequery ('ポスグレの全文検索');
+SELECT likequery ('\_%');
+SELECT likequery ('pg_bigmは検索性能を200%向上させました。');