[adamziel]

Allows a SQL dump to contain a replacement column value while leaving the stored source value unchanged.

The row reader accepts trusted column_read_expressions from server code. Normal reads, exact-row reloads, and oversized-value reads use the same expression. Text replacements keep the source column's character set so chunk boundaries do not split multibyte characters. Columns without a replacement keep their existing values. The HTTP endpoint does not accept these expressions from clients.

This is the first step of the Reprint exclusion stack. #817 uses it to remove Reprint from exported activation lists and adds the opt-in exclusion flag. #818 enables that flag by default for new pulls. This PR adds no Reprint exclusion behavior or CLI flags.

Testing

Export a table with a conditional column replacement and a small statement-size limit. Resume between SQL fragments, import the dump, and check that the selected value changed while the other row values and the source stayed unchanged. The regression test covers UTF-8, latin1, and binary values.

[github-actions]

Pull pipeline performance — large-directory

Site: large-directory · 2,000+ plus targeted file-transfer scenarios files · 10,000 posts · 25,000 postmeta · PHP 8.5.10

No changes above 5%.

Changes of 5% or less (25)

Stage	PR	trunk	Δ	Status	Details
playground-sqlite-db-pull	2.81 s	2.85 s	⚪ -39 ms (-1.4%)	✓	Metrics PR: condition=db-pull in PHP.wasm runtime=php.wasm 8.3 wp_mysql_parser=enabled mode=lexer native_lexer=verified native_token_stream=WP_MySQL_Native_Token_Stream native_token_count=18 native_parser=selected trunk: condition=db-pull in PHP.wasm runtime=php.wasm 8.3 wp_mysql_parser=enabled mode=lexer native_lexer=verified native_token_stream=WP_MySQL_Native_Token_Stream native_token_count=18 native_parser=selected
playground-sqlite-db-apply	23.88 s	23.15 s	⚪ +736 ms (+3.2%)	✓	Metrics PR: condition=db-apply to SQLite in PHP.wasm runtime=php.wasm 8.3 wp_mysql_parser=enabled mode=parser native_lexer=verified native_token_stream=WP_MySQL_Native_Token_Stream native_token_count=18 native_parser=verified native_ast=WP_MySQL_Native_Parser_Node sqlite_driver_parser=verified trunk: condition=db-apply to SQLite in PHP.wasm runtime=php.wasm 8.3 wp_mysql_parser=enabled mode=parser native_lexer=verified native_token_stream=WP_MySQL_Native_Token_Stream native_token_count=18 native_parser=verified native_ast=WP_MySQL_Native_Parser_Node sqlite_driver_parser=verified
url-rewrite-html	199 ms	197 ms	⚪ +1 ms (+0.7%)	✓	Metrics PR: rows=128 input_MiB=0.29 MiB_per_second=1.44 sample_ms=200.1, 199.2, 198.4, 198.8, 198.1 peak_MiB=24 trunk: rows=128 input_MiB=0.29 MiB_per_second=1.45 sample_ms=199.7, 197.8, 197.1, 197.2, 197.4 peak_MiB=24
url-rewrite-style-elements	46 ms	46 ms	⚪ +0 ms (+0.5%)	✓	Metrics PR: rows=128 input_MiB=0.32 MiB_per_second=7.01 sample_ms=46.7, 46.6, 45.6, 45.9, 46 peak_MiB=12 trunk: rows=128 input_MiB=0.32 MiB_per_second=7.04 sample_ms=46.6, 45.7, 45.7, 45.8, 45.9 peak_MiB=12
url-rewrite-style-large-value	765 ms	743 ms	⚪ +21 ms (+2.9%)	✓	Metrics PR: rows=1 input_MiB=0.65 MiB_per_second=0.85 sample_ms=770.1, 764.4, 764.8, 764.9, 763.7 peak_MiB=10 trunk: rows=1 input_MiB=0.65 MiB_per_second=0.87 sample_ms=745.9, 739.3, 743.4, 744.6, 741.8 peak_MiB=10
url-rewrite-blocks-literal-urls	69 ms	69 ms	⚪ +0 ms (+0.1%)	✓	Metrics PR: rows=128 input_MiB=0.65 MiB_per_second=9.53 sample_ms=69.6, 68.6, 68.3, 68.6, 68.3 peak_MiB=24 trunk: rows=128 input_MiB=0.65 MiB_per_second=9.55 sample_ms=69.5, 68.5, 68.3, 68.6, 68.5 peak_MiB=24
url-rewrite-blocks-nested-html	70 ms	70 ms	⚪ +0 ms (+0.2%)	✓	Metrics PR: rows=128 input_MiB=0.82 MiB_per_second=11.79 sample_ms=70.4, 69.5, 69.7, 69.5, 69.6 peak_MiB=28 trunk: rows=128 input_MiB=0.82 MiB_per_second=11.81 sample_ms=70.3, 69.1, 69.7, 69.5, 69.5 peak_MiB=28
url-rewrite-blocks-repeated-urls	70 ms	69 ms	⚪ +0 ms (+0.6%)	✓	Metrics PR: rows=128 input_MiB=0.81 MiB_per_second=11.65 sample_ms=70.6, 69.6, 69.5, 69.4, 69.4 peak_MiB=28 trunk: rows=128 input_MiB=0.81 MiB_per_second=11.72 sample_ms=70.1, 69.1, 69.1, 69.2, 69.1 peak_MiB=28
url-rewrite-blocks-escaped-quotes	302 ms	302 ms	⚪ -0 ms (-0.1%)	✓	Metrics PR: rows=128 input_MiB=0.85 MiB_per_second=2.83 sample_ms=304.2, 301.7, 301.1, 301.2, 301.6 peak_MiB=40 trunk: rows=128 input_MiB=0.85 MiB_per_second=2.82 sample_ms=303.6, 301.8, 302.1, 301.4, 301.8 peak_MiB=40
url-rewrite-blocks-encoded-shortcodes	504 ms	505 ms	⚪ -1 ms (-0.2%)	✓	Metrics PR: rows=128 input_MiB=1 MiB_per_second=1.98 sample_ms=506.8, 504.6, 503.9, 504.3, 504 peak_MiB=54 trunk: rows=128 input_MiB=1 MiB_per_second=1.98 sample_ms=506.2, 506.6, 505.1, 504.7, 504.9 peak_MiB=54
url-rewrite-blocks-no-source-urls	2 ms	2 ms	⚪ -0 ms (-0.5%)	✓	Metrics PR: rows=128 input_MiB=0.67 MiB_per_second=376.85 sample_ms=2.4, 1.8, 1.7, 1.7, 1.9 peak_MiB=14 trunk: rows=128 input_MiB=0.67 MiB_per_second=375.13 sample_ms=2.4, 1.8, 1.8, 1.7, 1.9 peak_MiB=14
url-rewrite-serialized-options	34 ms	34 ms	⚪ -0 ms (-1.2%)	✓	Metrics PR: rows=128 input_MiB=0.38 MiB_per_second=11.19 sample_ms=34.9, 33.8, 34, 34, 34.2 peak_MiB=20 trunk: rows=128 input_MiB=0.38 MiB_per_second=11.06 sample_ms=35.4, 34.6, 34.4, 34.3, 34.2 peak_MiB=20
url-rewrite-selected-site-html	109 ms	109 ms	⚪ +0 ms (+0.3%)	✓	Metrics PR: rows=128 input_MiB=0.29 MiB_per_second=2.63 sample_ms=111.7, 109.6, 109, 109.1, 108.6 peak_MiB=24 trunk: rows=128 input_MiB=0.29 MiB_per_second=2.64 sample_ms=110.4, 108.9, 108.3, 108.7, 108.8 peak_MiB=24
url-rewrite-selected-site-style-elements	185 ms	185 ms	⚪ +0 ms (+0.1%)	✓	Metrics PR: rows=128 input_MiB=0.32 MiB_per_second=1.74 sample_ms=187.3, 185.7, 185.4, 185.3, 184.9 peak_MiB=24 trunk: rows=128 input_MiB=0.32 MiB_per_second=1.74 sample_ms=187.7, 185.5, 185.2, 184.8, 185.1 peak_MiB=24
url-rewrite-selected-site-style-large-value	512 ms	511 ms	⚪ +1 ms (+0.3%)	✓	Metrics PR: rows=1 input_MiB=0.65 MiB_per_second=1.26 sample_ms=528.8, 512.4, 513.8, 512.3, 511.2 peak_MiB=26 trunk: rows=1 input_MiB=0.65 MiB_per_second=1.26 sample_ms=513.3, 511.1, 511.4, 510.1, 509.2 peak_MiB=26
url-rewrite-selected-site-blocks-literal-urls	84 ms	84 ms	⚪ +0 ms (+0.3%)	✓	Metrics PR: rows=128 input_MiB=0.65 MiB_per_second=7.81 sample_ms=84.7, 83.7, 84.1, 83.8, 83.8 peak_MiB=30 trunk: rows=128 input_MiB=0.65 MiB_per_second=7.83 sample_ms=84.8, 84.3, 83.6, 83.1, 83.4 peak_MiB=30
url-rewrite-selected-site-blocks-nested-html	212 ms	212 ms	⚪ +1 ms (+0.3%)	✓	Metrics PR: rows=128 input_MiB=0.82 MiB_per_second=3.87 sample_ms=213.8, 212.3, 212.3, 212.5, 212.3 peak_MiB=40 trunk: rows=128 input_MiB=0.82 MiB_per_second=3.88 sample_ms=212.8, 211.6, 211.6, 212, 211.7 peak_MiB=40
url-rewrite-selected-site-blocks-repeated-urls	159 ms	159 ms	⚪ -0 ms (-0.2%)	✓	Metrics PR: rows=128 input_MiB=0.81 MiB_per_second=5.11 sample_ms=159.6, 158.3, 158.3, 158.6, 158.8 peak_MiB=28 trunk: rows=128 input_MiB=0.81 MiB_per_second=5.1 sample_ms=159.6, 158.3, 159.2, 158.9, 159 peak_MiB=28
url-rewrite-selected-site-blocks-escaped-quotes	212 ms	213 ms	⚪ -2 ms (-0.8%)	✓	Metrics PR: rows=128 input_MiB=0.85 MiB_per_second=4.02 sample_ms=213.4, 211.8, 211.8, 212.1, 211.7 peak_MiB=40 trunk: rows=128 input_MiB=0.85 MiB_per_second=3.99 sample_ms=214.4, 213.5, 213.3, 213.2, 213.4 peak_MiB=40
url-rewrite-selected-site-blocks-encoded-shortcodes	401 ms	401 ms	⚪ +0 ms (+0.1%)	✓	Metrics PR: rows=128 input_MiB=1 MiB_per_second=2.49 sample_ms=402.1, 399.4, 400.8, 401.1, 403.2 peak_MiB=54 trunk: rows=128 input_MiB=1 MiB_per_second=2.49 sample_ms=402, 399.9, 399.4, 400.7, 400.7 peak_MiB=54
url-rewrite-selected-site-blocks-no-source-urls	2 ms	2 ms	⚪ -0 ms (-0.9%)	✓	Metrics PR: rows=128 input_MiB=0.67 MiB_per_second=361.01 sample_ms=2.5, 1.9, 1.8, 1.8, 2 peak_MiB=14 trunk: rows=128 input_MiB=0.67 MiB_per_second=357.59 sample_ms=2.5, 1.9, 1.8, 1.8, 2 peak_MiB=14
url-rewrite-selected-site-serialized-options	35 ms	35 ms	⚪ +0 ms (+0.7%)	✓	Metrics PR: rows=128 input_MiB=0.38 MiB_per_second=10.87 sample_ms=35.8, 34.8, 35, 35.1, 35 peak_MiB=20 trunk: rows=128 input_MiB=0.38 MiB_per_second=10.94 sample_ms=35.7, 34.7, 34.5, 34.8, 36.4 peak_MiB=20
url-rewrite-selected-site-child-paths-style-elements	188 ms	189 ms	⚪ -1 ms (-0.4%)	✓	Metrics PR: rows=128 input_MiB=0.32 MiB_per_second=1.71 sample_ms=190.2, 188.2, 187.9, 187.8, 187.9 peak_MiB=24 trunk: rows=128 input_MiB=0.32 MiB_per_second=1.71 sample_ms=190.4, 188.2, 188.2, 188.7, 188.6 peak_MiB=24
url-rewrite-selected-site-child-paths-blocks-nested-html	213 ms	215 ms	⚪ -2 ms (-1.0%)	✓	Metrics PR: rows=128 input_MiB=0.82 MiB_per_second=3.86 sample_ms=213.6, 213, 212.8, 212.8, 212.8 peak_MiB=40 trunk: rows=128 input_MiB=0.82 MiB_per_second=3.82 sample_ms=215.9, 215, 214.9, 216.5, 214.5 peak_MiB=40
url-rewrite-selected-site-child-paths-blocks-repeated-urls	159 ms	159 ms	⚪ +0 ms (+0.2%)	✓	Metrics PR: rows=128 input_MiB=0.81 MiB_per_second=5.1 sample_ms=159.9, 158.6, 159, 158.9, 159.5 peak_MiB=28 trunk: rows=128 input_MiB=0.81 MiB_per_second=5.11 sample_ms=159.6, 158.7, 158.6, 158.7, 158.7 peak_MiB=28

Total: PR 31.22 s · trunk 30.51 s · ⚪ +717 ms (+2.4%)

_{Numbers carry runner noise; treat single-run deltas as directional, not authoritative.}

URL rows show the median of five samples, using the same inputs and PHP binary for both builds. Each sample starts with fresh caches and reuses one rewriter across 128 distinct values. Input generation and output checks are outside the timer. Every output must pass before a speed is reported.

_{📈 Trunk performance history — commit-by-commit timeline.}