bkietz commented on a change in pull request #9621:
URL: https://github.com/apache/arrow/pull/9621#discussion_r592443814
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File path: cpp/src/arrow/compute/exec.cc
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@@ -838,6 +838,13 @@ class ScalarAggExecutor : public
KernelExecutorImpl<ScalarAggregateKernel> {
private:
Status Consume(const ExecBatch& batch) {
+ if (kernel_->nomerge) {
+ kernel_->consume(kernel_ctx_, batch);
+ ARROW_CTX_RETURN_IF_ERROR(kernel_ctx_);
+ return Status::OK();
+ }
Review comment:
This is a confusing aspect of the KernelExecutor contract which should
be documented: `KernelExecutor::Init` initializes the executor but assumes that
the kernel's `init` has already been called in the provided `KernelContext`.
This is to facilitate the case where `init` may be expensive and does not need
to be called again for each execution of the kernel, for example the same
lookup table can be re-used for all scanned batches in a dataset filter.
I'll add a comment clarifying this.
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