Add support for SET NAMES and SET CHARACTER SET as a no-op

Author: JanJakes

tests/WP_SQLite_Driver_Tests.php

@@ -6049,4 +6049,10 @@ public function testSelectColumnNames(): void {
 		$result = $this->assertQuery( "SELECT CONCAT('a', 'b') AS alias_concat" );
 		$this->assertSame( array( 'alias_concat' ), array_keys( (array) $result[0] ) );
 	}
+
+	public function testSetStatement(): void {
+		$this->assertQuery( 'SET NAMES utf8mb4' );
+		$this->assertQuery( 'SET CHARSET utf8mb4' );
+		$this->assertQuery( 'SET CHARACTER SET utf8mb4' );
+	}
 }

wp-includes/sqlite-ast/class-wp-sqlite-driver.php

@@ -2089,6 +2089,20 @@ private function execute_set_statement( WP_Parser_Node $node ): void {
 			}
 
 			if (
+				$part instanceof WP_MySQL_Token
+				&& WP_MySQL_Lexer::NAMES_SYMBOL === $part->id
+			) {
+				// "SET NAMES ..." is a no-op for now.
+				// TODO: Validate charset compatibility with UTF-8.
+				//       See: https://github.com/WordPress/sqlite-database-integration/issues/192
+			} elseif (
+				$part instanceof WP_Parser_Node
+				&& 'charsetClause' === $part->rule_name
+			) {
+				// "SET CHARACTER SET ..." is a no-op for now.
+				// TODO: Validate charset compatibility with UTF-8.
+				//       See: https://github.com/WordPress/sqlite-database-integration/issues/192
+			} elseif (
 				$part instanceof WP_Parser_Node
 				&& (
 					'internalVariableName' === $part->rule_name