[opt](exec) optimize fixed key packing (#65572) - #66220
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### What problem does this PR solve? Fixed-key packing could lose `restrict` alias information when the source data pointer was captured by reference in an outlined lambda, producing a less efficient copy loop. This change obtains the restricted pointer inside the lambda after nullable key replacement, preserving alias information without changing the key encoding or query behavior. (cherry picked from commit 0127314)
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yiguolei
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Jul 30, 2026
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What problem does this PR solve?
Fixed-key packing could lose
restrictalias information when the source data pointer was captured by reference in an outlined lambda, producing a less efficient copy loop. This change obtains the restricted pointer inside the lambda after nullable key replacement, preserving alias information without changing the key encoding or query behavior.(cherry picked from commit 0127314)
What problem does this PR solve?
Issue Number: close #xxx
Related PR: #xxx
Problem Summary:
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