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* SortMerge join support for IS NOT DISTINCT FROM. The patch adds a "requiredNonNullKeyParts" field to the sortMerge processor, which has the list of key parts that must be nonnull for an equijoin condition to match. Conditions with SQL "=" are present in the list; conditions with SQL "IS NOT DISTINCT FROM" are absent from the list. * Fix test. * Update javadoc.