CreateQuery sums (children 3)
 Identifier sums
 Columns definition (children 1)
  ExpressionList (children 3)
   ColumnDeclaration key (children 1)
    DataType LowCardinality (children 1)
     ExpressionList (children 1)
      DataType String
   ColumnDeclaration sumOfSums (children 1)
    DataType UInt64
   ColumnDeclaration sumsMap (children 1)
    DataType Nested (children 1)
     ExpressionList (children 2)
      NameTypePair key (children 1)
       DataType LowCardinality (children 1)
        ExpressionList (children 1)
         DataType String
      NameTypePair sum (children 1)
       DataType UInt64
 Storage definition (children 2)
  Function SummingMergeTree
  Identifier key
