vlsi commented on a change in pull request #2272:
URL: https://github.com/apache/calcite/pull/2272#discussion_r530183290
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File path: core/src/main/java/org/apache/calcite/rel/type/RelDataTypeImpl.java
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@@ -79,6 +79,10 @@ protected RelDataTypeImpl() {
@Override public RelDataTypeField getField(String fieldName, boolean
caseSensitive,
boolean elideRecord) {
+ if (fieldList == null) {
+ throw new IllegalStateException("Requested field " + fieldName
+ + " in a type with null fieldList, type = " + this);
Review comment:
I agree that `type with null fieldList` is too low-level for
`RelDataType` users, however, I don't know the better message.
The following might be slightly bit better: `"The current type " + this + "
does not support named field lookup, so field " + fieldName + " can't be
located"`
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