CreateQuery t1 (children 3)
 Identifier t1
 Columns definition (children 1)
  ExpressionList (children 3)
   ColumnDeclaration s1 (children 1)
    DataType String
   ColumnDeclaration s2 (children 1)
    DataType String
   ColumnDeclaration s3 (children 1)
    DataType String
 Storage definition (children 2)
  Function MergeTree
  Function tuple (children 1)
   ExpressionList
