Fix handling of DEFAULT TRUE and DEFAULT FALSE columns

Author: JanJakes

tests/WP_SQLite_Driver_Tests.php

@@ -499,6 +499,8 @@ public function testShowCreateTableWithDefaultValues(): void {
 				ID BIGINT PRIMARY KEY AUTO_INCREMENT NOT NULL,
 				no_default VARCHAR(255),
 				default_zero INT DEFAULT 0,
+				default_true INT DEFAULT TRUE,
+				default_false INT DEFAULT FALSE,
 				default_empty_string VARCHAR(255) DEFAULT '',
 				special_chars_1 TEXT NOT NULL COMMENT '\'',
 				special_chars_2 TEXT NOT NULL COMMENT '''',
@@ -528,6 +530,8 @@ public function testShowCreateTableWithDefaultValues(): void {
 					'  `ID` bigint NOT NULL AUTO_INCREMENT,',
 					'  `no_default` varchar(255) DEFAULT NULL,',
 					"  `default_zero` int DEFAULT '0',",
+					"  `default_true` int DEFAULT '1',",
+					"  `default_false` int DEFAULT '0',",
 					"  `default_empty_string` varchar(255) DEFAULT '',",
 					"  `special_chars_1` text NOT NULL COMMENT '''',",
 					"  `special_chars_2` text NOT NULL COMMENT '''',",

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

@@ -2053,15 +2053,35 @@ private function get_column_default( WP_Parser_Node $node ): ?string {
 			return null;
 		}
 
+		/*
+		 * [GRAMMAR]
+		 * DEFAULT_SYMBOL (
+		 *    signedLiteral
+		 *    | NOW_SYMBOL timeFunctionParameters?
+		 *    | {serverVersion >= 80013}? exprWithParentheses
+		 * )
+		 */
+
+		// DEFAULT NOW()
 		if ( $default_attr->has_child_token( WP_MySQL_Lexer::NOW_SYMBOL ) ) {
 			return 'CURRENT_TIMESTAMP';
 		}
 
-		if (
-			$default_attr->has_child_node( 'signedLiteral' )
-			&& null !== $default_attr->get_first_descendant_node( 'nullLiteral' )
-		) {
-			return null;
+		// DEFAULT signedLiteral
+		$signed_literal = $default_attr->get_first_child_node( 'signedLiteral' );
+		if ( $signed_literal ) {
+			$literal = $signed_literal->get_first_child_node( 'literal' );
+
+			// DEFAULT NULL
+			if ( $literal->has_child_node( 'nullLiteral' ) ) {
+				return null;
+			}
+
+			// DEFAULT TRUE or DEFAULT FALSE
+			if ( $literal->has_child_node( 'boolLiteral' ) ) {
+				$bool_literal = $literal->get_first_child_node( 'boolLiteral' );
+				return $bool_literal->has_child_token( WP_MySQL_Lexer::TRUE_SYMBOL ) ? '1' : '0';
+			}
 		}
 
 		// @TODO: MySQL seems to normalize default values for numeric