QL: add an consistency test for the totality of getParent()

Author: erik-krogh

ql/consistency-queries/AstConsistency.ql

@@ -0,0 +1,10 @@
+import ql
+private import codeql_ql.ast.internal.AstNodes as AstNodes
+
+query AstNode nonTotalGetParent() {
+  exists(AstNodes::toQL(result).getParent()) and
+  not exists(result.getParent()) and
+  not result.getLocation().getStartColumn() = 1 and // startcolumn = 1 <=> top level in file <=> fine to have no parent
+  not result instanceof YAML::YAMLNode and // parents for YAML doens't work
+  not (result instanceof QLDoc and result.getLocation().getFile().getExtension() = "dbscheme") // qldoc in dbschemes are not hooked up
+}