Fix constraints handling in ddl2cpp (#437)

Constraints got interpreted as (unknown) data types.
This change should fix this most cases (simple test case added).

scripts/ddl2cpp

@@ -259,7 +259,7 @@ ddlCreateTable = pp.Group(
     + pp.Suppress(pp.Optional(ddlIfNotExists))
     + ddlName.setResultsName("tableName")
     + ddlLeft
-    + pp.Group(pp.delimitedList(ddlColumn | pp.Suppress(ddlConstraint))).setResultsName(
+    + pp.Group(pp.delimitedList(pp.Suppress(ddlConstraint) | ddlColumn)).setResultsName(
         "columns"
     )
     + ddlRight

tests/scripts/ddl2cpp_sample_good.sql

@@ -28,12 +28,13 @@ CREATE TABLE tab_foo
 (
 	delta varchar(255),
 	_epsilon bigint,
-	`omega` double
+	`omega` double,
+        CONSTRAINT uc_delta UNIQUE (delta, _epsilon)
 );
 
 CREATE TABLE tab_bar
 (
-	alpha bigint AUTO_INCREMENT,
+	alpha bigint AUTO_INCREMENT RRIMARY_KEY,
 	beta varchar(255) NULL DEFAULT "",
 	gamma bool NOT NULL,
 	delta int