3bc13e6412
### What changes were proposed in this pull request?
This pr makes cast string type to decimal decimal type fast fail if precision larger that 38.
### Why are the changes needed?
It is very slow if precision very large.
Benchmark and benchmark result:
```scala
import org.apache.spark.benchmark.Benchmark
val bd1 = new java.math.BigDecimal("6.0790316E+25569151")
val bd2 = new java.math.BigDecimal("6.0790316E+25");
val benchmark = new Benchmark("Benchmark string to decimal", 1, minNumIters = 2)
benchmark.addCase(bd1.toString) { _ =>
println(Decimal(bd1).precision)
}
benchmark.addCase(bd2.toString) { _ =>
println(Decimal(bd2).precision)
}
benchmark.run()
```
```
Java HotSpot(TM) 64-Bit Server VM 1.8.0_251-b08 on Mac OS X 10.15.6
Intel(R) Core(TM) i9-9980HK CPU 2.40GHz
Benchmark string to decimal: Best Time(ms) Avg Time(ms) Stdev(ms) Rate(M/s) Per Row(ns) Relative
------------------------------------------------------------------------------------------------------------------------
6.0790316E+25569151 9340 9381 57 0.0 9340094625.0 1.0X
6.0790316E+25 0 0 0 0.5 2150.0 4344230.1X
```
Stacktrace:
### Does this PR introduce _any_ user-facing change?
No.
### How was this patch tested?
Unit test and benchmark test:
Dataset | Before this pr (Seconds) | After this pr (Seconds)
-- | -- | --
https://issues.apache.org/jira/secure/attachment/13011406/part-00000.parquet | 2640 | 2
Closes #29731 from wangyum/SPARK-32706.
Authored-by: Yuming Wang <yumwang@ebay.com>
Signed-off-by: Wenchen Fan <wenchen@databricks.com>
|
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| .. | ||
| benchmarks | ||
| src | ||
| pom.xml | ||
