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Compute compressed parallel workers based on uncompressed pages #9125

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Compute compressed parallel workers based on uncompressed pages
akuzm Jan 14, 2026
336702e
benchmark parallel estimates (2026-01-14 no. 3)
akuzm Jan 14, 2026
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12 changes: 11 additions & 1 deletion tsl/src/nodes/columnar_scan/columnar_scan.c
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Original file line number Diff line number Diff line change
Expand Up @@ -2439,8 +2439,18 @@ create_compressed_scan_paths(PlannerInfo *root, RelOptInfo *compressed_rel,
*/
if (compressed_rel->consider_parallel && required_outer == NULL)
{
const float compression_ratio_guess = 5.;
int effective_pages = compressed_rel->pages
/ (float) compressed_rel->reltarget->width
* compression_info->chunk_rel->reltarget->width
* compression_info->compressed_batch_size
/ compression_ratio_guess;
effective_pages = Max(effective_pages, 1);
// fprintf(stderr, "compressed width %d uncompressed %d\n",
// compressed_rel->reltarget->width, compression_info->chunk_rel->reltarget->width);
// fprintf(stderr, "compressed pages %d effective %d\n", compressed_rel->pages, effective_pages);
int parallel_workers = compute_parallel_worker(compressed_rel,
compressed_rel->pages,
effective_pages,
-1,
max_parallel_workers_per_gather);

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