CreateQuery source_data (children 3)
 Identifier source_data
 Columns definition (children 2)
  ExpressionList (children 4)
   ColumnDeclaration pk (children 1)
    DataType Int32
   ColumnDeclaration sk (children 1)
    DataType Int32
   ColumnDeclaration val (children 1)
    DataType UInt32
   ColumnDeclaration partition_key (children 2)
    DataType UInt32
    Literal UInt64_1
  Identifier pk
 Storage definition (children 2)
  Function MergeTree
  Function tuple (children 1)
   ExpressionList (children 2)
    Identifier pk
    Identifier sk
