CreateQuery test_mapcontainskey (children 3)
 Identifier test_mapcontainskey
 Columns definition (children 1)
  ExpressionList (children 3)
   ColumnDeclaration id (children 1)
    DataType UInt64
   ColumnDeclaration m.keys (children 1)
    DataType Array (children 1)
     ExpressionList (children 1)
      DataType String
   ColumnDeclaration m (children 1)
    DataType Map (children 1)
     ExpressionList (children 2)
      DataType String
      DataType UInt64
 Storage definition (children 2)
  Function MergeTree
  Function tuple (children 1)
   ExpressionList
