CreateQuery mt (children 3)
 Identifier mt
 Columns definition (children 1)
  ExpressionList (children 3)
   ColumnDeclaration uid (children 1)
    DataType UInt64
   ColumnDeclaration ts (children 1)
    DataType DateTime
   ColumnDeclaration val (children 1)
    DataType Float64
 Storage definition (children 3)
  Function MergeTree
  Function toDate (children 1)
   ExpressionList (children 1)
    Identifier ts
  Function tuple (children 1)
   ExpressionList (children 2)
    Identifier uid
    Identifier ts