Table 5.

Q-error, MAE, and SMAPE of different cardinality estimators with the DMV dataset.

Method	Q-Error	MAE	SMAPE
PostgreSQL	1 × ${10}^5$	/	/
MySQL	1 × ${10}^5$	/	/
TreeRNN	1.71	1526	0.40
VSCNN	3.01	2593	0.55
MSCN (string)	2.96	2418	0.43
NoSamplingTreeLSTM	8.90	4374	0.86
NoSamplingTreeLSTM	2.36	2106	0.33
TreeLSTM (ours)	1.49	923	0.36