Implement DROP CHECK statement

Author: JanJakes

tests/WP_SQLite_Driver_Tests.php

@@ -9179,8 +9179,13 @@ public function testAlterTableAddCheckConstraint(): void {
 	}
 
 	public function testAlterTableDropCheckConstraint(): void {
-		$this->assertQuery( 'CREATE TABLE t (id INT, CONSTRAINT c CHECK (id > 0))' );
-		$this->assertQuery( 'ALTER TABLE t DROP CONSTRAINT c' );
+		$this->assertQuery( 'CREATE TABLE t (id INT, CONSTRAINT c1 CHECK (id > 0), CONSTRAINT c2 CHECK (id < 10))' );
+
+		// DROP CONSTRAINT syntax.
+		$this->assertQuery( 'ALTER TABLE t DROP CONSTRAINT c1' );
+
+		// DROP CHECK syntax.
+		$this->assertQuery( 'ALTER TABLE t DROP CHECK c2' );
 
 		// SHOW CREATE TABLE
 		$this->assertQuery( 'SHOW CREATE TABLE t' );

wp-includes/sqlite-ast/class-wp-sqlite-information-schema-builder.php

@@ -682,6 +682,13 @@ public function record_alter_table( WP_Parser_Node $node ): void {
 					continue;
 				}
 
+				// DROP CHECK
+				if ( $action->has_child_token( WP_MySQL_Lexer::CHECK_SYMBOL ) ) {
+					$name = $this->get_value( $action->get_first_child_node( 'identifier' ) );
+					$this->record_drop_check_constraint( $table_is_temporary, $table_name, $name );
+					continue;
+				}
+
 				// DROP [COLUMN]
 				$column_ref = $action->get_first_child_node( 'fieldIdentifier' );
 				if ( null !== $column_ref ) {