CreateQuery test (children 3)
 Identifier test
 Columns definition (children 1)
  ExpressionList (children 3)
   ColumnDeclaration col1 (children 1)
    DataType Nullable (children 1)
     ExpressionList (children 1)
      DataType DOUBLE
   ColumnDeclaration col2 (children 1)
    DataType Nullable (children 1)
     ExpressionList (children 1)
      DataType DOUBLE
   ColumnDeclaration col3 (children 1)
    DataType DOUBLE
 Storage definition (children 1)
  Function Memory
