[td-13039] fix bug.

ccd5727b · Haojun Liao · c4ace188 · ccd5727b
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source/libs/parser/src/queryInfoUtil.c source/libs/parser/src/queryInfoUtil.c +2 -0

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--- a/source/libs/parser/src/queryInfoUtil.c
+++ b/source/libs/parser/src/queryInfoUtil.c
@@ -244,6 +244,8 @@ void assignExprInfo(SExprInfo* dst, const SExprInfo* src) {
  if (src->base.numOfCols > 0) {
    dst->base.pColumns = calloc(src->base.numOfCols, sizeof(SColumn));
    memcpy(dst->base.pColumns, src->base.pColumns, sizeof(SColumn) * src->base.numOfCols);
+  } else {
+    dst->base.pColumns = NULL;
  }
  memset(dst->base.param, 0, sizeof(SVariant) * tListLen(dst->base.param));