CreateQuery customer (children 3)
 Identifier customer
 Columns definition (children 1)
  ExpressionList (children 2)
   ColumnDeclaration c_custkey (children 1)
    DataType Int32
   ColumnDeclaration c_nationkey (children 1)
    DataType Int32
 Storage definition (children 2)
  Function MergeTree
  Identifier c_custkey
