CreateQuery t_proj_external_agg (children 3)
 Identifier t_proj_external_agg
 Columns definition (children 1)
  ExpressionList (children 4)
   ColumnDeclaration k1 (children 1)
    DataType UInt32
   ColumnDeclaration k2 (children 1)
    DataType UInt32
   ColumnDeclaration k3 (children 1)
    DataType UInt32
   ColumnDeclaration value (children 1)
    DataType UInt32
 Storage definition (children 2)
  Function MergeTree
  Function tuple (children 1)
   ExpressionList
