Avoid creating new RecordBatches to simplify expressions#20534
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alamb wants to merge 1 commit intoapache:mainfrom
Open
Avoid creating new RecordBatches to simplify expressions#20534alamb wants to merge 1 commit intoapache:mainfrom
alamb wants to merge 1 commit intoapache:mainfrom
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alamb
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Feb 24, 2026
| let col = new_null_array(&DataType::Null, 1); | ||
| Ok(RecordBatch::try_new(dummy_schema, vec![col])?) | ||
| pub(crate) fn create_dummy_batch() -> Result<&'static RecordBatch> { | ||
| static DUMMY_BATCH: std::sync::OnceLock<Result<RecordBatch>> = |
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The idea is to compute the result once and then reuse it each time rather than create a new batch and array each time
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I don't really expect to be able to measure the improvement here but I'll run benchmarks to check |
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run benchmark sql_planner |
AdamGS
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Feb 24, 2026
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LGTM :) I think I had this at some point, but I couldn't measure a difference, even though it's obviously strictly less work
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🤖: Benchmark completed Details
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Yeah, I agree I will be surprised if this shows up in the traces. The first benchmark run seems to show improvements but I suspect it is just noise. I will rerun to see if I can reproduce |
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run benchmark sql_planner |
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🤖: Benchmark completed Details
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Which issue does this PR close?
simplify_const_expr#20234Rationale for this change
While reviewing #20234 from @AdamGS I wondered why we were creating new
RecordBatches to simplify expressions. I looked into it a bit and I think we can avoid a bunch of small allocations / deallocationsWhat changes are included in this PR?
Are these changes tested?
Yes by CI. I will also run benchmarks on it
Are there any user-facing changes?
No this is entirely internal