PostgreSQL: Allow comparing json columns (fix #1107)

CHANGELOG.md

@@ -8,6 +8,7 @@
 - PostgreSQL: Display index expressions
 - PostgreSQL: Add SQL operator to select
 - PostgreSQL: Hide only partitions, not all inherited tables from menu
+- PostgreSQL: Allow comparing json columns (bug #1107)
 - PostgreSQL 11-: Avoid duplicate oid in table status (bug #1089)
 - Elasticsearch: Support dropping aliases
 - Plugins: Methods processList() and killProcess()

adminer/include/functions.inc.php

@@ -264,9 +264,10 @@ function where(array $where, array $fields = array()): string {
 		$field_type = $field["type"];
 		$return[] = $column
 			. (JUSH == "sql" && $field_type == "json" ? " = CAST(" . q($val) . " AS JSON)"
+				: (JUSH == "pgsql" && preg_match('~^json~', $field_type) ? "::jsonb = " . q($val) . "::jsonb"
 				: (JUSH == "sql" && is_numeric($val) && preg_match('~\.~', $val) ? " LIKE " . q($val) // LIKE because of floats but slow with ints
 				: (JUSH == "mssql" && strpos($field_type, "datetime") === false ? " LIKE " . q(preg_replace('~[_%[]~', '[\0]', $val)) // LIKE because of text but it does not work with datetime
-				: " = " . unconvert_field($field, q($val)))))
+				: " = " . unconvert_field($field, q($val))))))
 		; //! enum and set
 		if (JUSH == "sql" && preg_match('~char|text~', $field_type) && preg_match("~[^ -@]~", $val)) { // not just [a-z] to catch non-ASCII characters
 			$return[] = "$column = " . q($val) . " COLLATE " . charset(connection()) . "_bin";