Reminiscent commented on code in PR #20334:
URL: https://github.com/apache/doris/pull/20334#discussion_r1217808848
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fe/fe-core/src/main/java/org/apache/doris/analysis/Expr.java:
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@@ -989,7 +989,8 @@ public TExpr treeToThrift() {
// Hack to ensure BE never sees TYPE_NULL. If an expr makes it
this far without
// being cast to a non-NULL type, the type doesn't matter and we
can cast it
// arbitrarily.
- Preconditions.checkState(this instanceof NullLiteral || this
instanceof SlotRef);
+ Preconditions.checkState(this instanceof NullLiteral || this
instanceof SlotRef
+ || this instanceof VariableExpr);
Review Comment:
Because when we `set @a=null` and use the `@a` in the statement, for
example, `select @a ....`. The `@a` will be built as `VariableExpr` not the
`NullLiteral`
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