Start of new ANTLR4 based parser.

Very simple tests pass.

pglablib/sqlast/SelectStatement.cpp

@@ -0,0 +1,19 @@
+#include "SelectStatement.h"
+#include "SelectList.h"
+
+using namespace sqlast;
+
+SelectStatement::SelectStatement()
+{
+
+}
+
+SelectList* SelectStatement::GetSelectList()
+{
+    return selectList.get();
+}
+
+void SelectStatement::SetSelectList(std::unique_ptr<SelectList> value)
+{
+    selectList = std::move(value);
+}