CreateQuery data (children 3)
 Identifier data
 Columns definition (children 1)
  ExpressionList (children 3)
   ColumnDeclaration ts (children 1)
    DataType DateTime
   ColumnDeclaration field (children 1)
    DataType String
   ColumnDeclaration num_field (children 1)
    DataType Nullable (children 1)
     ExpressionList (children 1)
      DataType Float64
 Storage definition (children 3)
  Function MergeTree (children 1)
   ExpressionList
  Identifier ts
  Identifier ts