[CALCITE-7597] Support ORDER BY ALL#5010
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mihaibudiu
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When ORDER BY ALL appears with no order items, sort by every expression in the SELECT clause, in select-list order. An optional trailing ASC/DESC and NULLS FIRST/LAST applies to all keys. The parser emits an ORDER_BY_ALL marker (wrapped in DESC/NULLS_FIRST/NULLS_LAST when a direction is given); SqlValidatorImpl.validateOrderList expands it to the SELECT items, re-applying the direction to each key. SELECT * is rejected. Includes parser + validator tests and reference docs.
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JIRA: https://issues.apache.org/jira/browse/CALCITE-7597