omalley commented on a change in pull request #810:
URL: https://github.com/apache/orc/pull/810#discussion_r682128050
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File path: java/core/src/java/org/apache/orc/impl/ReaderImpl.java
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@@ -569,7 +561,13 @@ public ReaderImpl(Path path, OrcFile.ReaderOptions
options) throws IOException {
this.rowIndexStride = tail.getFooter().getRowIndexStride();
this.contentLength = tail.getFooter().getContentLength();
this.numberOfRows = tail.getFooter().getNumberOfRows();
- this.userMetadata = tail.getFooter().getMetadataList();
+ this.userMetadata = tail.getFooter().getMetadataList()
+ .stream().collect(Collectors.toMap(
Review comment:
The java stream apis are very slow. It would perform better if you used
a loop. This is especially important, because now the set is build
preemptively, even if the user doesn't need the metadata values.
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