CreateQuery test_null_filter (children 3)
 Identifier test_null_filter
 Columns definition (children 1)
  ExpressionList (children 2)
   ColumnDeclaration key (children 1)
    DataType UInt64
   ColumnDeclaration value (children 1)
    DataType UInt32
 Storage definition (children 3)
  Function MergeTree
  Identifier key
  Set
