Set null to true for fields that default to NULL

Author: Michael Hahn

src/SQLParser.php

@@ -689,6 +689,10 @@ function parse_field($tokens){
 		# [DEFAULT default_value]
 		if (count($tokens) >= 1 && StrToUpper($tokens[0]) == 'DEFAULT'){
 			$f['default'] = $this->decode_value($tokens[1]);
+			if ($f['default'] === 'NULL'){
+				$f['null'] = true;
+			}
+
 			array_shift($tokens);
 			array_shift($tokens);
 		}

tests/FieldTest.php

@@ -317,6 +317,17 @@ function testFieldOptions(){
 			# [COLUMN_FORMAT {FIXED|DYNAMIC|DEFAULT}]
 			# [STORAGE {DISK|MEMORY|DEFAULT}]
 			# [reference_definition]
+
+			$fields = $this->get_fields("bar VARCHAR(255) DEFAULT NULL");
+			$this->assertEquals([
+				[
+					'name' => "bar",
+					'type' => "VARCHAR",
+					'length' => 255,
+					'default' => 'NULL',
+					'null' => true,
+				]
+			], $fields);
 		}
 
 		function testVirtualOptions(){