zabetak commented on a change in pull request #2272:
URL: https://github.com/apache/calcite/pull/2272#discussion_r528544841
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File path: core/src/main/java/org/apache/calcite/tools/RelBuilder.java
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@@ -495,6 +495,10 @@ public RexNode field(int inputCount, String alias, String
fieldName) {
/** Returns a reference to a given field of a record-valued expression. */
public RexNode field(RexNode e, String name) {
+ if (!e.getType().isStruct()) {
+ throw new IllegalArgumentException("Requested field " + name + " in
non-struct expression "
+ + e.toString() + " (type: " + e.getType() + ")");
+ }
Review comment:
I am wondering where is it better to add this check here or inside
`RexBuilder#makeFieldAccess`. Clients who call `RexBuilder` direclty will still
get the NPE.
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