CreateQuery merge_tree_table1 (children 3)
 Identifier merge_tree_table1
 Columns definition (children 1)
  ExpressionList (children 2)
   ColumnDeclaration s (children 1)
    DataType LowCardinality (children 1)
     ExpressionList (children 1)
      DataType String
   ColumnDeclaration x (children 1)
    DataType UInt32
 Storage definition (children 3)
  Function MergeTree
  Identifier x
  Set
