[jira] [Created] (CALCITE-4596) RelFieldTrimmer#trimFields fails if values row type is empty record

["Konstantin Orlov (Jira)" <ji...@apache.org>]

Konstantin Orlov created CALCITE-4596:
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             Summary: RelFieldTrimmer#trimFields fails if values row type is empty record
                 Key: CALCITE-4596
                 URL: https://issues.apache.org/jira/browse/CALCITE-4596
             Project: Calcite
          Issue Type: Bug
          Components: core
    Affects Versions: 1.26.0
            Reporter: Konstantin Orlov


Currently an exception is thrown when LogicalValues having no fields is passed to {{RelFieldTrimmer#trimFields(LogicalValues, ImmutableBitSet, Set<RelDataTypeField>)}}.

The reason is while trying to avoid producing an empty record, the code below is not expecting the row type of the input could be already an empty record.
{code:java}
  public TrimResult trimFields(
      LogicalValues values,
      ImmutableBitSet fieldsUsed,
      Set<RelDataTypeField> extraFields) {
    final RelDataType rowType = values.getRowType();
    final int fieldCount = rowType.getFieldCount();

    // If they are asking for no fields, we can't give them what they want,
    // because zero-column records are illegal. Give them the last field,
    // which is unlikely to be a system field.
    if (fieldsUsed.isEmpty()) {
      fieldsUsed = ImmutableBitSet.range(fieldCount - 1, fieldCount);
    }
{code}
 



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