Add support for SHOW FULL COLUMNS

Author: JanJakes

tests/WP_SQLite_Driver_Metadata_Tests.php

@@ -628,6 +628,38 @@ public function testShowTableStatus() {
 		);
 	}
 
+	public function testShowFullColumns(): void {
+		$this->assertQuery( "CREATE TABLE t (id INT COMMENT 'Comment ID', name TEXT COMMENT 'Comment Name')" );
+		$result = $this->assertQuery( 'SHOW FULL COLUMNS FROM t' );
+		$this->assertEquals(
+			array(
+				(object) array(
+					'Field'      => 'id',
+					'Type'       => 'int',
+					'Collation'  => null,
+					'Null'       => 'YES',
+					'Key'        => '',
+					'Default'    => null,
+					'Extra'      => '',
+					'Privileges' => 'select,insert,update,references',
+					'Comment'    => 'Comment ID',
+				),
+				(object) array(
+					'Field'      => 'name',
+					'Type'       => 'text',
+					'Collation'  => 'utf8mb4_0900_ai_ci',
+					'Null'       => 'YES',
+					'Key'        => '',
+					'Default'    => null,
+					'Extra'      => '',
+					'Privileges' => 'select,insert,update,references',
+					'Comment'    => 'Comment Name',
+				),
+			),
+			$result
+		);
+	}
+
 	public function testShowColumnsLike(): void {
 		$this->assertQuery( 'CREATE TABLE t (id INT, val1 INT, val2 INT, name TEXT)' );
 		$result = $this->assertQuery( "SHOW COLUMNS FROM t LIKE 'val%'" );

wp-includes/sqlite-ast/class-wp-pdo-mysql-on-sqlite.php

@@ -2897,20 +2897,43 @@ private function execute_show_columns_statement( WP_Parser_Node $node ): void {
 			$condition = $this->translate_show_like_or_where_condition( $like_or_where, 'column_name' );
 		}
 
+		// Handle the FULL keyword.
+		$command_type = $node->get_first_child_node( 'showCommandType' );
+		$is_full      = $command_type && $command_type->has_child_token( WP_MySQL_Lexer::FULL_SYMBOL );
+
 		// Fetch column information.
 		$columns_table = $this->information_schema_builder->get_table_name( $table_is_temporary, 'columns' );
-		$stmt          = $this->execute_sqlite_query(
+
+		if ( $is_full ) {
+			$fields = '
+				column_name AS `Field`,
+				column_type AS `Type`,
+				collation_name AS `Collation`,
+				is_nullable AS `Null`,
+				column_key AS `Key`,
+				column_default AS `Default`,
+				extra AS `Extra`,
+				privileges AS `Privileges`,
+				column_comment AS `Comment`
+			';
+		} else {
+			$fields = '
+				column_name AS `Field`,
+				column_type AS `Type`,
+				is_nullable AS `Null`,
+				column_key AS `Key`,
+				column_default AS `Default`,
+				extra AS `Extra`
+			';
+		}
+
+		$stmt = $this->execute_sqlite_query(
 			sprintf(
-				'SELECT
-					column_name AS `Field`,
-					column_type AS `Type`,
-					is_nullable AS `Null`,
-					column_key AS `Key`,
-					column_default AS `Default`,
-					extra AS `Extra`
+				'SELECT %s
 				FROM %s
 				WHERE table_schema = ? AND table_name = ? %s
 				ORDER BY ordinal_position',
+				$fields,
 				$this->quote_sqlite_identifier( $columns_table ),
 				$condition ?? ''
 			),