adding explain test

pingcap · Oct 17, 2018 · 4623f36 · 4623f36
1 parent 8bd985f
commit 4623f36
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diff --git a/cmd/explaintest/r/explain_easy.result b/cmd/explaintest/r/explain_easy.result
@@ -385,3 +385,29 @@ Projection_5	8000.00	root	test.ta.a
     └─TableReader_9	10000.00	root	data:TableScan_8
       └─TableScan_8	10000.00	cop	table:ta, range:[-inf,+inf], keep order:false, stats:pseudo
 rollback;
+drop table if exists t;
+create table t(a int, nb int not null, nc int not null);
+explain select ifnull(a, 0) from t;
+id	count	task	operator info
+Projection_3	10000.00	root	ifnull(test.t.a, 0)
+└─TableReader_5	10000.00	root	data:TableScan_4
+  └─TableScan_4	10000.00	cop	table:t, range:[-inf,+inf], keep order:false, stats:pseudo
+explain select ifnull(nb, 0) from t;
+id	count	task	operator info
+TableReader_5	10000.00	root	data:TableScan_4
+└─TableScan_4	10000.00	cop	table:t, range:[-inf,+inf], keep order:false, stats:pseudo
+explain select ifnull(nb, 0), ifnull(nc, 0) from t;
+id	count	task	operator info
+TableReader_5	10000.00	root	data:TableScan_4
+└─TableScan_4	10000.00	cop	table:t, range:[-inf,+inf], keep order:false, stats:pseudo
+explain select ifnull(a, 0), ifnull(nb, 0) from t;
+id	count	task	operator info
+Projection_3	10000.00	root	ifnull(test.t.a, 0), test.t.nb
+└─TableReader_5	10000.00	root	data:TableScan_4
+  └─TableScan_4	10000.00	cop	table:t, range:[-inf,+inf], keep order:false, stats:pseudo
+explain select ifnull(nb, 0), ifnull(nb, 0) from t;
+id	count	task	operator info
+Projection_3	10000.00	root	test.t.nb, test.t.nb
+└─TableReader_5	10000.00	root	data:TableScan_4
+  └─TableScan_4	10000.00	cop	table:t, range:[-inf,+inf], keep order:false, stats:pseudo
+drop table if exists t;
diff --git a/cmd/explaintest/t/explain_easy.test b/cmd/explaintest/t/explain_easy.test
@@ -81,3 +81,13 @@ begin;
 insert tb values ('1');
 explain select * from ta where a = 1;
 rollback;
+
+# https://github.com/pingcap/tidb/issues/7918
+drop table if exists t;
+create table t(a int, nb int not null, nc int not null);
+explain select ifnull(a, 0) from t;
+explain select ifnull(nb, 0) from t;
+explain select ifnull(nb, 0), ifnull(nc, 0) from t;
+explain select ifnull(a, 0), ifnull(nb, 0) from t;
+explain select ifnull(nb, 0), ifnull(nb, 0) from t;
+drop table if exists t;