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_r338440708
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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 +47,17 @@ 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 {
+ val reader = OrcFile.createReader(filePath, readerOptions)
Review comment:
Yes but the `reader.getRawDataSize` is built on the [column
statistics](https://github.com/apache/orc/blob/master/java/core/src/java/org/apache/orc/impl/ReaderImpl.java#L785)
of the ORC files so this is expected to be an efficient way to calculate the
size in memory.
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