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  1. Calcite
  2. CALCITE-3221

Add MergeUnion operator in Enumerable convention

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    Details

    • Type: Improvement
    • Status: Closed
    • Priority: Minor
    • Resolution: Fixed
    • Affects Version/s: 1.19.0
    • Fix Version/s: 1.27.0
    • Component/s: core

      Description

      Currently, the union operation offered by CalciteĀ (seeĀ EnumerableDefaults.union) "breaks" the collation (if any) of its inputs.

      The goal of this issue is to create a new union algorithm in Enumerable convention (EnumerableMergeUnion) that, given the fact that its inputs are sorted by the same collation, will return the union / union all result respecting this collation.

      Most likely the implementation of the merge join can be useful.

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            • Assignee:
              rubenql Ruben Q L
              Reporter:
              zabetak Stamatis Zampetakis

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