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由 Ashuka Xue 提交于
This commit corresponds to the ORCA commit "Implement Full Merge Join" In GPDB 5, merge join is disabled, but the following changes were made to continue allowing compilation of GPDB 5 with ORCA. 1. Translator changes for Merge Join. 2. Add IsOpMergeJoinable() and GetMergeJoinOpFamilies() wrappers.
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