fix(query): add null ptr check.

e5e21bf6 · Haojun Liao · 188c3a98 · e5e21bf6
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source/libs/executor/src/executil.c source/libs/executor/src/executil.c +2 -1

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--- a/source/libs/executor/src/executil.c
+++ b/source/libs/executor/src/executil.c
@@ -989,7 +989,8 @@ SArray* extractColMatchInfo(SNodeList* pNodeList, SDataBlockDescNode* pOutputNod

    if (pNode->output) {
      (*numOfOutputCols) += 1;
-    } else {
+    } else if (info != NULL) {
+      // select distinct tbname from stb where tbname='abc';
      info->output = false;
    }
  }