Start of new ANTLR4 based parser.

Very simple tests pass.

pglablib/sqlast/ColumnDefinition.h

@@ -0,0 +1,28 @@
+#pragma once
+
+#include "Node.h"
+#include <QString>
+#include <memory>
+
+namespace sqlast {
+
+class TypeSpecification;
+
+/// Defines the details of a table column
+///
+/// Constraints are not included here, as we handle constraints can apply to multiple columns
+/// and we want to put them all in one place. The UI and SQL generator is allowed to display
+/// column specific constraints with the column they belong to.
+class ColumnDefinition : public Node
+{
+public:
+    ColumnDefinition();
+
+private:
+    QString name;
+    std::unique_ptr<TypeSpecification> typeName;
+    bool notNull = true;
+
+};
+
+}