attilapiros commented on a change in pull request #26016: [SPARK-24914][SQL]
New statistic to improve data size estimate for columnar storage formats
URL: https://github.com/apache/spark/pull/26016#discussion_r357607262
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File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/orc/OrcUtils.scala
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@@ -46,6 +47,16 @@ object OrcUtils extends Logging {
"ZLIB" -> ".zlib",
"LZO" -> ".lzo")
+ def rawSize(hadoopConf: Configuration, filePath: Path): BigInt = {
+ val fs = filePath.getFileSystem(hadoopConf)
+ val readerOptions = OrcFile.readerOptions(hadoopConf).filesystem(fs)
+ try {
+ Utils.tryWithResource(OrcFile.createReader(filePath,
readerOptions))(_.getRawDataSize)
Review comment:
It uses the column statistics of ORC, see [the relevant part of
ReaderImpl](https://github.com/apache/orc/blob/bf6fc4ffab026e74557c50de9f2a827ddf535bdb/java/core/src/java/org/apache/orc/impl/ReaderImpl.java#L767-L864)
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