CreateQuery table_b (children 3)
 Identifier table_b
 Columns definition (children 1)
  ExpressionList (children 3)
   ColumnDeclaration event_id (children 1)
    DataType UInt64
   ColumnDeclaration something (children 1)
    DataType Nullable (children 1)
     ExpressionList (children 1)
      DataType String
   ColumnDeclaration other (children 1)
    DataType String
 Storage definition (children 2)
  Function MergeTree
  Identifier event_id
