CreateQuery prod_hist (children 3)
 Identifier prod_hist
 Columns definition (children 1)
  ExpressionList (children 2)
   ColumnDeclaration categoryId (children 1)
    DataType UUID
   ColumnDeclaration productId (children 1)
    DataType UUID
 Storage definition (children 2)
  Function MergeTree
  Identifier productId
