dossett opened a new pull request, #3654:
URL: https://github.com/apache/iceberg-python/pull/3654

   <p dir="auto" style="box-sizing: border-box; margin-top: 0px !important; 
margin-bottom: 16px; color: rgb(240, 246, 252); font-family: &quot;Mona Sans 
VF&quot;, -apple-system, &quot;system-ui&quot;, &quot;Segoe UI&quot;, 
&quot;Noto Sans&quot;, Helvetica, Arial, sans-serif, &quot;Apple Color 
Emoji&quot;, &quot;Segoe UI Emoji&quot;; font-size: 14px; font-style: normal; 
font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; 
letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; 
text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 
0px; white-space: normal; background-color: rgb(13, 17, 23); 
text-decoration-thickness: initial; text-decoration-style: initial; 
text-decoration-color: initial;">I used CODEX to analyze this problem and 
create this PR. I've reviewed the code and test and stand by them. This summary 
is written completely by a human (me) other than very light copy editing by an 
LLM.</p><p dir="auto" style="box-si
 zing: border-box; margin-top: 0px; margin-bottom: 16px; color: rgb(240, 246, 
252); font-family: &quot;Mona Sans VF&quot;, -apple-system, 
&quot;system-ui&quot;, &quot;Segoe UI&quot;, &quot;Noto Sans&quot;, Helvetica, 
Arial, sans-serif, &quot;Apple Color Emoji&quot;, &quot;Segoe UI Emoji&quot;; 
font-size: 14px; font-style: normal; font-variant-ligatures: normal; 
font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 
2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; 
word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: normal; 
background-color: rgb(13, 17, 23); text-decoration-thickness: initial; 
text-decoration-style: initial; text-decoration-color: initial;">Problem: 
During planning a predicate is applied to return the appropriate contents. 
Parts of the predicate can be removed because they're already satisfied the 
partition scheme in a table. What can't be removed is the<span> </span><code 
class="notranslate" style="box-sizing
 : border-box; font-family: &quot;Monaspace Neon&quot;, ui-monospace, 
SFMono-Regular, &quot;SF Mono&quot;, Menlo, Consolas, &quot;Liberation 
Mono&quot;, monospace; font-size: 11.9px; tab-size: 4; white-space: 
break-spaces; background-color: rgba(101, 108, 118, 0.2); border-radius: 6px; 
margin: 0px; padding: 0.2em 0.4em;">residual</code>. Currently a residual is 
constructed for every file. However, all files in a directory for a given 
partition spec and given values of the partition spec will have the same 
residual, so recalculating the residual is wasteful.</p><p dir="auto" 
style="box-sizing: border-box; margin-top: 0px; margin-bottom: 16px; color: 
rgb(240, 246, 252); font-family: &quot;Mona Sans VF&quot;, -apple-system, 
&quot;system-ui&quot;, &quot;Segoe UI&quot;, &quot;Noto Sans&quot;, Helvetica, 
Arial, sans-serif, &quot;Apple Color Emoji&quot;, &quot;Segoe UI Emoji&quot;; 
font-size: 14px; font-style: normal; font-variant-ligatures: normal; 
font-variant-caps: normal; font-weight: 4
 00; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; 
text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 
0px; white-space: normal; background-color: rgb(13, 17, 23); 
text-decoration-thickness: initial; text-decoration-style: initial; 
text-decoration-color: initial;">This change caches the file-level residual. 
The key is the partition spec used by the predicate and the actual values of 
the spec. If a predicate doesn't use of the partition columns for a table it 
won't be in the key.</p><p dir="auto" style="box-sizing: border-box; 
margin-top: 0px; margin-bottom: 16px; color: rgb(240, 246, 252); font-family: 
&quot;Mona Sans VF&quot;, -apple-system, &quot;system-ui&quot;, &quot;Segoe 
UI&quot;, &quot;Noto Sans&quot;, Helvetica, Arial, sans-serif, &quot;Apple 
Color Emoji&quot;, &quot;Segoe UI Emoji&quot;; font-size: 14px; font-style: 
normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 
400; letter-spacing: normal
 ; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; 
widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: 
normal; background-color: rgb(13, 17, 23); text-decoration-thickness: initial; 
text-decoration-style: initial; text-decoration-color: initial;">The cache is 
limited to 128 keys (sort of an arbitrary starting point) and should have a 
minimal footprint.</p><p dir="auto" style="box-sizing: border-box; margin-top: 
0px; margin-bottom: 16px; color: rgb(240, 246, 252); font-family: &quot;Mona 
Sans VF&quot;, -apple-system, &quot;system-ui&quot;, &quot;Segoe UI&quot;, 
&quot;Noto Sans&quot;, Helvetica, Arial, sans-serif, &quot;Apple Color 
Emoji&quot;, &quot;Segoe UI Emoji&quot;; font-size: 14px; font-style: normal; 
font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; 
letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; 
text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 
0px; wh
 ite-space: normal; background-color: rgb(13, 17, 23); 
text-decoration-thickness: initial; text-decoration-style: initial; 
text-decoration-color: initial;">CODEX generated summary follows:</p><hr 
style="box-sizing: border-box; height: 0.25em; overflow: hidden; border: 0px; 
background: 0px 0px rgb(61, 68, 77); margin: 24px 0px; padding: 0px; 
font-family: &quot;Mona Sans VF&quot;, -apple-system, &quot;system-ui&quot;, 
&quot;Segoe UI&quot;, &quot;Noto Sans&quot;, Helvetica, Arial, sans-serif, 
&quot;Apple Color Emoji&quot;, &quot;Segoe UI Emoji&quot;; font-size: 14px; 
font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; 
font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; 
text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; 
-webkit-text-stroke-width: 0px; white-space: normal; text-decoration-thickness: 
initial; text-decoration-style: initial; text-decoration-color: initial;"><h1 
dir="auto" style="box-sizing: border-box; margi
 n: 24px 0px 16px; font-size: 2em; font-weight: 600; line-height: 1.25; 
border-bottom: 1px solid rgba(61, 68, 77, 0.7); padding-bottom: 0.3em; color: 
rgb(240, 246, 252); font-family: &quot;Mona Sans VF&quot;, -apple-system, 
&quot;system-ui&quot;, &quot;Segoe UI&quot;, &quot;Noto Sans&quot;, Helvetica, 
Arial, sans-serif, &quot;Apple Color Emoji&quot;, &quot;Segoe UI Emoji&quot;; 
font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; 
letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; 
text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 
0px; white-space: normal; background-color: rgb(13, 17, 23); 
text-decoration-thickness: initial; text-decoration-style: initial; 
text-decoration-color: initial;">Rationale for this change</h1><p dir="auto" 
style="box-sizing: border-box; margin-top: 0px; margin-bottom: 16px; color: 
rgb(240, 246, 252); font-family: &quot;Mona Sans VF&quot;, -apple-system, 
&quot;system-ui&quot;, &quot;S
 egoe UI&quot;, &quot;Noto Sans&quot;, Helvetica, Arial, sans-serif, 
&quot;Apple Color Emoji&quot;, &quot;Segoe UI Emoji&quot;; font-size: 14px; 
font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; 
font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; 
text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; 
-webkit-text-stroke-width: 0px; white-space: normal; background-color: rgb(13, 
17, 23); text-decoration-thickness: initial; text-decoration-style: initial; 
text-decoration-color: initial;">Scan planning currently constructs a new 
residual evaluator for every data file and repeatedly rebuilds the partition 
schema while projecting predicates. For scans with many files and a large 
combined filter, this repeats identical work and can dominate driver-side 
planning time.</p><p dir="auto" style="box-sizing: border-box; margin-top: 0px; 
margin-bottom: 16px; color: rgb(240, 246, 252); font-family: &quot;Mona Sans 
VF&quot;, -apple-sy
 stem, &quot;system-ui&quot;, &quot;Segoe UI&quot;, &quot;Noto Sans&quot;, 
Helvetica, Arial, sans-serif, &quot;Apple Color Emoji&quot;, &quot;Segoe UI 
Emoji&quot;; font-size: 14px; font-style: normal; font-variant-ligatures: 
normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; 
orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 
2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: normal; 
background-color: rgb(13, 17, 23); text-decoration-thickness: initial; 
text-decoration-style: initial; text-decoration-color: initial;">Files can also 
differ in partition fields that the scan filter never references. Those fields 
cannot affect the residual, but including them in a cache key prevents reuse. 
This is particularly costly for layouts with a high-cardinality partition hash: 
files with the same predicate-relevant partition values still appear 
unique.</p><p dir="auto" style="box-sizing: border-box; margin-top: 0px; 
margin-botto
 m: 16px; color: rgb(240, 246, 252); font-family: &quot;Mona Sans VF&quot;, 
-apple-system, &quot;system-ui&quot;, &quot;Segoe UI&quot;, &quot;Noto 
Sans&quot;, Helvetica, Arial, sans-serif, &quot;Apple Color Emoji&quot;, 
&quot;Segoe UI Emoji&quot;; font-size: 14px; font-style: normal; 
font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; 
letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; 
text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 
0px; white-space: normal; background-color: rgb(13, 17, 23); 
text-decoration-thickness: initial; text-decoration-style: initial; 
text-decoration-color: initial;">This change:</p><ul dir="auto" 
style="box-sizing: border-box; margin-top: 0px; margin-bottom: 16px; padding: 
0px; position: relative; color: rgb(240, 246, 252); font-family: &quot;Mona 
Sans VF&quot;, -apple-system, &quot;system-ui&quot;, &quot;Segoe UI&quot;, 
&quot;Noto Sans&quot;, Helvetica, Arial, sans-serif, &quot;App
 le Color Emoji&quot;, &quot;Segoe UI Emoji&quot;; font-size: 14px; font-style: 
normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 
400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; 
text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 
0px; white-space: normal; background-color: rgb(13, 17, 23); 
text-decoration-thickness: initial; text-decoration-style: initial; 
text-decoration-color: initial;"><li style="box-sizing: border-box; 
margin-left: 24px;">Reuses one residual evaluator per partition spec.</li><li 
style="box-sizing: border-box; margin-top: 0.25em; margin-left: 
24px;">Constructs each evaluator's partition schema once.</li><li 
style="box-sizing: border-box; margin-top: 0.25em; margin-left: 24px;">Binds 
the scan filter once and extracts its referenced source field IDs.</li><li 
style="box-sizing: border-box; margin-top: 0.25em; margin-left: 24px;">Derives 
the relevant partition-field positions separa
 tely for each spec, including every transform of a referenced source.</li><li 
style="box-sizing: border-box; margin-top: 0.25em; margin-left: 24px;">Caches 
residuals by partition spec ID and only the relevant partition 
values.</li></ul><p dir="auto" style="box-sizing: border-box; margin-top: 0px; 
margin-bottom: 16px; color: rgb(240, 246, 252); font-family: &quot;Mona Sans 
VF&quot;, -apple-system, &quot;system-ui&quot;, &quot;Segoe UI&quot;, 
&quot;Noto Sans&quot;, Helvetica, Arial, sans-serif, &quot;Apple Color 
Emoji&quot;, &quot;Segoe UI Emoji&quot;; font-size: 14px; font-style: normal; 
font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; 
letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; 
text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 
0px; white-space: normal; background-color: rgb(13, 17, 23); 
text-decoration-thickness: initial; text-decoration-style: initial; 
text-decoration-color: initial;">The cache is
  local to one planning call and bounded to 128 entries. Keeping the spec ID in 
the key preserves isolation across evolved partition specs. Partition pruning 
and delete-file matching continue to use the complete partition record.</p><h2 
dir="auto" style="box-sizing: border-box; margin-top: 24px; margin-bottom: 
16px; font-size: 1.5em; font-weight: 600; line-height: 1.25; border-bottom: 1px 
solid rgba(61, 68, 77, 0.7); padding-bottom: 0.3em; color: rgb(240, 246, 252); 
font-family: &quot;Mona Sans VF&quot;, -apple-system, &quot;system-ui&quot;, 
&quot;Segoe UI&quot;, &quot;Noto Sans&quot;, Helvetica, Arial, sans-serif, 
&quot;Apple Color Emoji&quot;, &quot;Segoe UI Emoji&quot;; font-style: normal; 
font-variant-ligatures: normal; font-variant-caps: normal; letter-spacing: 
normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; 
widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: 
normal; background-color: rgb(13, 17, 23); text-decoration-thicknes
 s: initial; text-decoration-style: initial; text-decoration-color: 
initial;">Performance</h2><p dir="auto" style="box-sizing: border-box; 
margin-top: 0px; margin-bottom: 16px; color: rgb(240, 246, 252); font-family: 
&quot;Mona Sans VF&quot;, -apple-system, &quot;system-ui&quot;, &quot;Segoe 
UI&quot;, &quot;Noto Sans&quot;, Helvetica, Arial, sans-serif, &quot;Apple 
Color Emoji&quot;, &quot;Segoe UI Emoji&quot;; font-size: 14px; font-style: 
normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 
400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; 
text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 
0px; white-space: normal; background-color: rgb(13, 17, 23); 
text-decoration-thickness: initial; text-decoration-style: initial; 
text-decoration-color: initial;">The benchmark plans 2,000 files with a 66-leaf 
filter. Every file has a unique high-cardinality partition-hash value that is 
not referenced by the filter. 
 Results report the mean of three in-process 
runs:</p><markdown-accessiblity-table data-catalyst="" style="box-sizing: 
border-box; display: block; color: rgb(240, 246, 252); font-family: &quot;Mona 
Sans VF&quot;, -apple-system, &quot;system-ui&quot;, &quot;Segoe UI&quot;, 
&quot;Noto Sans&quot;, Helvetica, Arial, sans-serif, &quot;Apple Color 
Emoji&quot;, &quot;Segoe UI Emoji&quot;; font-size: 14px; font-style: normal; 
font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; 
letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; 
text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 
0px; white-space: normal; background-color: rgb(13, 17, 23); 
text-decoration-thickness: initial; text-decoration-style: initial; 
text-decoration-color: initial;">
   Predicate-relevant partitions | main | This PR | Improvement
   -- | -- | -- | --
   7 | 2.941 s | 0.010 s | ~294x faster
   2,000 | 3.174 s | 1.523 s | ~2.1x faster
   
   </markdown-accessiblity-table><p dir="auto" style="box-sizing: border-box; 
margin-top: 0px; margin-bottom: 16px; color: rgb(240, 246, 252); font-family: 
&quot;Mona Sans VF&quot;, -apple-system, &quot;system-ui&quot;, &quot;Segoe 
UI&quot;, &quot;Noto Sans&quot;, Helvetica, Arial, sans-serif, &quot;Apple 
Color Emoji&quot;, &quot;Segoe UI Emoji&quot;; font-size: 14px; font-style: 
normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 
400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; 
text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 
0px; white-space: normal; background-color: rgb(13, 17, 23); 
text-decoration-thickness: initial; text-decoration-style: initial; 
text-decoration-color: initial;">Against the earlier version of this PR that 
keyed on the complete partition tuple, the seven-partition case improved from 
1.895 seconds to 0.010 seconds. The 2,000-relevant-partition miss case was 
effectively unchang
 ed (1.509 seconds versus 1.523 seconds), showing that excluding irrelevant 
values restores cache reuse without introducing a meaningful miss-path 
regression.</p><p dir="auto" style="box-sizing: border-box; margin-top: 0px; 
margin-bottom: 16px; color: rgb(240, 246, 252); font-family: &quot;Mona Sans 
VF&quot;, -apple-system, &quot;system-ui&quot;, &quot;Segoe UI&quot;, 
&quot;Noto Sans&quot;, Helvetica, Arial, sans-serif, &quot;Apple Color 
Emoji&quot;, &quot;Segoe UI Emoji&quot;; font-size: 14px; font-style: normal; 
font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; 
letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; 
text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 
0px; white-space: normal; background-color: rgb(13, 17, 23); 
text-decoration-thickness: initial; text-decoration-style: initial; 
text-decoration-color: initial;">This is an isolated scan-planning benchmark: 
manifest entry loading is stubbed so it me
 asures residual evaluation and<span> </span><code class="notranslate" 
style="box-sizing: border-box; font-family: &quot;Monaspace Neon&quot;, 
ui-monospace, SFMono-Regular, &quot;SF Mono&quot;, Menlo, Consolas, 
&quot;Liberation Mono&quot;, monospace; font-size: 11.9px; tab-size: 4; 
white-space: break-spaces; background-color: rgba(101, 108, 118, 0.2); 
border-radius: 6px; margin: 0px; padding: 0.2em 
0.4em;">FileScanTask</code><span> </span>construction. It does not include 
catalog access, manifest I/O, or downstream data execution, so these numbers 
are not an end-to-end query-speed claim.</p><h2 dir="auto" style="box-sizing: 
border-box; margin-top: 24px; margin-bottom: 16px; font-size: 1.5em; 
font-weight: 600; line-height: 1.25; border-bottom: 1px solid rgba(61, 68, 77, 
0.7); padding-bottom: 0.3em; color: rgb(240, 246, 252); font-family: &quot;Mona 
Sans VF&quot;, -apple-system, &quot;system-ui&quot;, &quot;Segoe UI&quot;, 
&quot;Noto Sans&quot;, Helvetica, Arial, sans-serif, &quot;Ap
 ple Color Emoji&quot;, &quot;Segoe UI Emoji&quot;; font-style: normal; 
font-variant-ligatures: normal; font-variant-caps: normal; letter-spacing: 
normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; 
widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: 
normal; background-color: rgb(13, 17, 23); text-decoration-thickness: initial; 
text-decoration-style: initial; text-decoration-color: initial;">Are these 
changes tested?</h2><p dir="auto" style="box-sizing: border-box; margin-top: 
0px; margin-bottom: 16px; color: rgb(240, 246, 252); font-family: &quot;Mona 
Sans VF&quot;, -apple-system, &quot;system-ui&quot;, &quot;Segoe UI&quot;, 
&quot;Noto Sans&quot;, Helvetica, Arial, sans-serif, &quot;Apple Color 
Emoji&quot;, &quot;Segoe UI Emoji&quot;; font-size: 14px; font-style: normal; 
font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; 
letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; 
text-transform:
  none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; 
white-space: normal; background-color: rgb(13, 17, 23); 
text-decoration-thickness: initial; text-decoration-style: initial; 
text-decoration-color: initial;">Yes.</p><ul dir="auto" style="box-sizing: 
border-box; margin-top: 0px; margin-bottom: 16px; padding: 0px; position: 
relative; color: rgb(240, 246, 252); font-family: &quot;Mona Sans VF&quot;, 
-apple-system, &quot;system-ui&quot;, &quot;Segoe UI&quot;, &quot;Noto 
Sans&quot;, Helvetica, Arial, sans-serif, &quot;Apple Color Emoji&quot;, 
&quot;Segoe UI Emoji&quot;; font-size: 14px; font-style: normal; 
font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; 
letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; 
text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 
0px; white-space: normal; background-color: rgb(13, 17, 23); 
text-decoration-thickness: initial; text-decoration-style: initial; text-decorat
 ion-color: initial;"><li style="box-sizing: border-box; margin-left: 
24px;">Added coverage proving partition schemas are constructed once per 
residual evaluator.</li><li style="box-sizing: border-box; margin-top: 0.25em; 
margin-left: 24px;">Added coverage for reuse by relevant partition values and 
isolation across evolved specs.</li><li style="box-sizing: border-box; 
margin-top: 0.25em; margin-left: 24px;">Added coverage proving unreferenced 
partition fields are ignored and referenced fields remain in the key.</li><li 
style="box-sizing: border-box; margin-top: 0.25em; margin-left: 24px;">Added 
coverage for multiple partition transforms of the same referenced 
source.</li><li style="box-sizing: border-box; margin-top: 0.25em; margin-left: 
24px;">Added coverage for bounded-cache eviction and correctness after 
eviction.</li><li style="box-sizing: border-box; margin-top: 0.25em; 
margin-left: 24px;">Added an EtsyML-shaped benchmark with a unique irrelevant 
hash per file.</li><li style="bo
 x-sizing: border-box; margin-top: 0.25em; margin-left: 24px;">Focused planner 
and residual suite: 134 passed.</li><li style="box-sizing: border-box; 
margin-top: 0.25em; margin-left: 24px;">Full non-integration unit suite: 3,773 
passed, 1,560 deselected.</li><li style="box-sizing: border-box; margin-top: 
0.25em; margin-left: 24px;">All repository hooks pass, including Ruff, mypy, 
pydocstyle, codespell, and lockfile validation.</li></ul><h2 dir="auto" 
style="box-sizing: border-box; margin-top: 24px; margin-bottom: 16px; 
font-size: 1.5em; font-weight: 600; line-height: 1.25; border-bottom: 1px solid 
rgba(61, 68, 77, 0.7); padding-bottom: 0.3em; color: rgb(240, 246, 252); 
font-family: &quot;Mona Sans VF&quot;, -apple-system, &quot;system-ui&quot;, 
&quot;Segoe UI&quot;, &quot;Noto Sans&quot;, Helvetica, Arial, sans-serif, 
&quot;Apple Color Emoji&quot;, &quot;Segoe UI Emoji&quot;; font-style: normal; 
font-variant-ligatures: normal; font-variant-caps: normal; letter-spacing: 
normal; orphan
 s: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; 
word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: normal; 
background-color: rgb(13, 17, 23); text-decoration-thickness: initial; 
text-decoration-style: initial; text-decoration-color: initial;">Are there any 
user-facing changes?</h2><p dir="auto" style="box-sizing: border-box; 
margin-top: 0px; margin-bottom: 16px; color: rgb(240, 246, 252); font-family: 
&quot;Mona Sans VF&quot;, -apple-system, &quot;system-ui&quot;, &quot;Segoe 
UI&quot;, &quot;Noto Sans&quot;, Helvetica, Arial, sans-serif, &quot;Apple 
Color Emoji&quot;, &quot;Segoe UI Emoji&quot;; font-size: 14px; font-style: 
normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 
400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; 
text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 
0px; white-space: normal; background-color: rgb(13, 17, 23); 
text-decoration-thickness:
  initial; text-decoration-style: initial; text-decoration-color: 
initial;">There are no API or result-semantics changes. Local scan planning is 
faster for filtered scans, especially when many files differ only in partition 
fields unrelated to the scan predicate.</p><h2 dir="auto" style="box-sizing: 
border-box; margin-top: 24px; margin-bottom: 16px; font-size: 1.5em; 
font-weight: 600; line-height: 1.25; border-bottom: 1px solid rgba(61, 68, 77, 
0.7); padding-bottom: 0.3em; color: rgb(240, 246, 252); font-family: &quot;Mona 
Sans VF&quot;, -apple-system, &quot;system-ui&quot;, &quot;Segoe UI&quot;, 
&quot;Noto Sans&quot;, Helvetica, Arial, sans-serif, &quot;Apple Color 
Emoji&quot;, &quot;Segoe UI Emoji&quot;; font-style: normal; 
font-variant-ligatures: normal; font-variant-caps: normal; letter-spacing: 
normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; 
widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: 
normal; background-color: rgb(13,
  17, 23); text-decoration-thickness: initial; text-decoration-style: initial; 
text-decoration-color: initial;">AI assistance</h2><p dir="auto" 
style="box-sizing: border-box; margin-top: 0px; margin-bottom: 0px !important; 
color: rgb(240, 246, 252); font-family: &quot;Mona Sans VF&quot;, 
-apple-system, &quot;system-ui&quot;, &quot;Segoe UI&quot;, &quot;Noto 
Sans&quot;, Helvetica, Arial, sans-serif, &quot;Apple Color Emoji&quot;, 
&quot;Segoe UI Emoji&quot;; font-size: 14px; font-style: normal; 
font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; 
letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; 
text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 
0px; white-space: normal; background-color: rgb(13, 17, 23); 
text-decoration-thickness: initial; text-decoration-style: initial; 
text-decoration-color: initial;">Codex assisted with implementation, test 
scaffolding, benchmark design, and PR drafting. I reviewed the logic
  and validated it with the full unit suite and isolated before/after 
benchmarks.</p>


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