ARROW-895: Fix lastSet in fillEmpties() and copyFrom()#601
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ARROW-895: Fix lastSet in fillEmpties() and copyFrom()#601StevenMPhillips wants to merge 1 commit into
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julienledem
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Author: Steven Phillips <steven@dremio.com> Closes apache#601 from StevenMPhillips/fillEmpties4 and squashes the following commits: 4707673 [Steven Phillips] ARROW-895: Fix lastSet in fillEmpties() and copyFrom()
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Author: Steven Phillips <steven@dremio.com> Closes apache#601 from StevenMPhillips/fillEmpties4 and squashes the following commits: 4707673 [Steven Phillips] ARROW-895: Fix lastSet in fillEmpties() and copyFrom()
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…ache#602) ### Rationale for this change Multiple threads can attempt to create the same llvm expression in Gandiva. This isn't allowed with the new JIT compiler, so synchronizing will prevent this scenario. ### What changes are included in this PR? Synchronize some methods to avoid adding duplicate llvm expressions. ### Are these changes tested? Yes, through unit tests in Gandiva. ### Are there any user-facing changes? No. Closes apacheGH-601
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