HHH-18784 TableMigrator shouldn't alter column length if length is not explicitly-set

Author: quaff

hibernate-core/src/main/java/org/hibernate/tool/schema/internal/ColumnDefinitions.java

@@ -51,7 +51,7 @@ static boolean hasMatchingType(Column column, ColumnInformation columnInformatio
 	}
 
 	static boolean hasMatchingLength(Column column, ColumnInformation columnInformation, Metadata metadata, Dialect dialect) {
-		if ( !column.getSqlType( metadata ).contains("(") ) {
+		if ( !column.isExplicit() || !column.getSqlType( metadata ).contains("(") ) {
 			// the DDL type does not explicitly specify a length,
 			// and so we do not require an exact match
 			return true;