cache the index of named parameters #23
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The commit changes bind to cache the position of named parameters, which
improves the performance of prepared queries that are re-used.
```
goos: darwin
goarch: arm64
pkg: github.com/charlievieth/go-sqlite3
cpu: Apple M4 Pro
│ o10.txt │ n10.txt │
│ sec/op │ sec/op vs base │
Scan10Cols-14 4.279µ ± 0% 4.264µ ± 3% ~ (p=0.579 n=10)
Suite/BenchmarkExec/Params-14 715.2n ± 1% 716.3n ± 1% ~ (p=0.927 n=10)
Suite/BenchmarkExec/NoParams-14 533.1n ± 2% 517.9n ± 3% -2.86% (p=0.001 n=10)
Suite/BenchmarkExecContext/Params-14 1.560µ ± 4% 1.504µ ± 0% -3.56% (p=0.000 n=10)
Suite/BenchmarkExecContext/NoParams-14 1.523µ ± 2% 1.518µ ± 1% ~ (p=1.000 n=10)
Suite/BenchmarkExecStep-14 452.5µ ± 2% 444.6µ ± 1% -1.76% (p=0.015 n=10)
Suite/BenchmarkExecContextStep-14 444.1µ ± 2% 451.7µ ± 1% +1.72% (p=0.043 n=10)
Suite/BenchmarkExecTx-14 1.607µ ± 1% 1.585µ ± 1% -1.40% (p=0.000 n=10)
Suite/BenchmarkQuery-14 1.757µ ± 1% 1.784µ ± 0% +1.51% (p=0.001 n=10)
Suite/BenchmarkQuerySimple-14 1.008µ ± 2% 1.015µ ± 1% ~ (p=0.117 n=10)
Suite/BenchmarkQueryContext/Background-14 2.380µ ± 1% 2.315µ ± 0% -2.73% (p=0.001 n=10)
Suite/BenchmarkQueryContext/WithCancel-14 8.314µ ± 1% 8.236µ ± 4% ~ (p=0.225 n=10)
Suite/BenchmarkParams-14 1.952µ ± 1% 2.012µ ± 1% +3.07% (p=0.000 n=10)
Suite/BenchmarkStmt-14 1.373µ ± 1% 1.394µ ± 1% +1.57% (p=0.001 n=10)
Suite/BenchmarkRows-14 58.61µ ± 3% 59.95µ ± 1% +2.29% (p=0.029 n=10)
Suite/BenchmarkStmtRows-14 58.80µ ± 2% 59.82µ ± 2% +1.73% (p=0.050 n=10)
Suite/BenchmarkStmt10Cols-14 4.409µ ± 1% 4.466µ ± 0% +1.30% (p=0.006 n=10)
Suite/BenchmarkScanRawBytes-14 2.499µ ± 1% 2.470µ ± 1% -1.18% (p=0.001 n=10)
Suite/BenchmarkQueryParallel-14 438.3n ± 5% 439.0n ± 4% ~ (p=0.812 n=10)
Suite/BenchmarkOpen-14 13.13µ ± 1% 13.05µ ± 2% ~ (p=0.197 n=10)
Suite/BenchmarkNamedParams-14 1.675µ ± 1% 1.196µ ± 2% -28.60% (p=0.000 n=10)
Suite/BenchmarkParseTime-14 1.040µ ± 2% 1.019µ ± 2% -2.02% (p=0.000 n=10)
geomean 4.173µ 4.102µ -1.69%
│ o10.txt │ n10.txt │
│ B/op │ B/op vs base │
Scan10Cols-14 712.0 ± 0% 712.0 ± 0% ~ (p=1.000 n=10) ¹
Suite/BenchmarkExec/Params-14 200.0 ± 0% 216.0 ± 0% +8.00% (p=0.000 n=10)
Suite/BenchmarkExec/NoParams-14 64.00 ± 0% 64.00 ± 0% ~ (p=1.000 n=10) ¹
Suite/BenchmarkExecContext/Params-14 360.0 ± 0% 376.0 ± 0% +4.44% (p=0.000 n=10)
Suite/BenchmarkExecContext/NoParams-14 208.0 ± 0% 208.0 ± 0% ~ (p=1.000 n=10) ¹
Suite/BenchmarkExecStep-14 64.00 ± 0% 64.00 ± 0% ~ (p=1.000 n=10) ¹
Suite/BenchmarkExecContextStep-14 208.0 ± 0% 208.0 ± 0% ~ (p=1.000 n=10)
Suite/BenchmarkExecTx-14 520.0 ± 0% 520.0 ± 0% ~ (p=1.000 n=10) ¹
Suite/BenchmarkQuery-14 640.0 ± 0% 656.0 ± 0% +2.50% (p=0.000 n=10)
Suite/BenchmarkQuerySimple-14 440.0 ± 0% 456.0 ± 0% +3.64% (p=0.000 n=10)
Suite/BenchmarkQueryContext/Background-14 396.0 ± 0% 396.0 ± 0% ~ (p=1.000 n=10) ¹
Suite/BenchmarkQueryContext/WithCancel-14 1.016Ki ± 0% 1.015Ki ± 0% ~ (p=0.121 n=10)
Suite/BenchmarkParams-14 784.0 ± 0% 800.0 ± 0% +2.04% (p=0.000 n=10)
Suite/BenchmarkStmt-14 784.0 ± 0% 784.0 ± 0% ~ (p=1.000 n=10) ¹
Suite/BenchmarkRows-14 6.047Ki ± 0% 6.062Ki ± 0% +0.26% (p=0.000 n=10)
Suite/BenchmarkStmtRows-14 6.055Ki ± 0% 6.055Ki ± 0% ~ (p=1.000 n=10) ¹
Suite/BenchmarkStmt10Cols-14 712.0 ± 0% 712.0 ± 0% ~ (p=1.000 n=10) ¹
Suite/BenchmarkScanRawBytes-14 592.0 ± 0% 592.0 ± 0% ~ (p=1.000 n=10) ¹
Suite/BenchmarkQueryParallel-14 532.0 ± 0% 548.0 ± 0% +3.01% (p=0.000 n=10)
Suite/BenchmarkOpen-14 111.0 ± 1% 111.0 ± 1% ~ (p=1.000 n=10)
Suite/BenchmarkNamedParams-14 664.0 ± 0% 600.0 ± 0% -9.64% (p=0.000 n=10)
Suite/BenchmarkParseTime-14 444.0 ± 0% 444.0 ± 0% ~ (p=1.000 n=10) ¹
geomean 479.5 482.4 +0.60%
¹ all samples are equal
│ o10.txt │ n10.txt │
│ allocs/op │ allocs/op vs base │
Scan10Cols-14 19.00 ± 0% 19.00 ± 0% ~ (p=1.000 n=10) ¹
Suite/BenchmarkExec/Params-14 8.000 ± 0% 8.000 ± 0% ~ (p=1.000 n=10) ¹
Suite/BenchmarkExec/NoParams-14 4.000 ± 0% 4.000 ± 0% ~ (p=1.000 n=10) ¹
Suite/BenchmarkExecContext/Params-14 10.00 ± 0% 10.00 ± 0% ~ (p=1.000 n=10) ¹
Suite/BenchmarkExecContext/NoParams-14 6.000 ± 0% 6.000 ± 0% ~ (p=1.000 n=10) ¹
Suite/BenchmarkExecStep-14 4.000 ± 0% 4.000 ± 0% ~ (p=1.000 n=10) ¹
Suite/BenchmarkExecContextStep-14 6.000 ± 0% 6.000 ± 0% ~ (p=1.000 n=10) ¹
Suite/BenchmarkExecTx-14 18.00 ± 0% 18.00 ± 0% ~ (p=1.000 n=10) ¹
Suite/BenchmarkQuery-14 22.00 ± 0% 22.00 ± 0% ~ (p=1.000 n=10) ¹
Suite/BenchmarkQuerySimple-14 13.00 ± 0% 13.00 ± 0% ~ (p=1.000 n=10) ¹
Suite/BenchmarkQueryContext/Background-14 10.00 ± 0% 10.00 ± 0% ~ (p=1.000 n=10) ¹
Suite/BenchmarkQueryContext/WithCancel-14 26.00 ± 0% 26.00 ± 0% ~ (p=1.000 n=10) ¹
Suite/BenchmarkParams-14 23.00 ± 0% 23.00 ± 0% ~ (p=1.000 n=10) ¹
Suite/BenchmarkStmt-14 23.00 ± 0% 23.00 ± 0% ~ (p=1.000 n=10) ¹
Suite/BenchmarkRows-14 418.0 ± 0% 418.0 ± 0% ~ (p=1.000 n=10) ¹
Suite/BenchmarkStmtRows-14 418.0 ± 0% 418.0 ± 0% ~ (p=1.000 n=10) ¹
Suite/BenchmarkStmt10Cols-14 19.00 ± 0% 19.00 ± 0% ~ (p=1.000 n=10) ¹
Suite/BenchmarkScanRawBytes-14 18.00 ± 0% 18.00 ± 0% ~ (p=1.000 n=10) ¹
Suite/BenchmarkQueryParallel-14 15.00 ± 0% 15.00 ± 0% ~ (p=1.000 n=10) ¹
Suite/BenchmarkOpen-14 3.000 ± 0% 3.000 ± 0% ~ (p=1.000 n=10) ¹
Suite/BenchmarkNamedParams-14 14.00 ± 0% 13.00 ± 0% -7.14% (p=0.000 n=10)
Suite/BenchmarkParseTime-14 12.00 ± 0% 12.00 ± 0% ~ (p=1.000 n=10) ¹
geomean 15.93 15.87 -0.34%
¹ all samples are equal
```
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The commit changes bind to cache the position of named parameters, which improves the performance of prepared queries that are re-used.