CreateQuery testx (children 3)
 Identifier testx
 Columns definition (children 1)
  ExpressionList (children 2)
   ColumnDeclaration t (children 1)
    DataType Int32
   ColumnDeclaration a (children 1)
    DataType UInt8
 Storage definition (children 2)
  Function MergeTree
  Function tuple (children 1)
   ExpressionList