wgtmac commented on code in PR #1026:
URL: https://github.com/apache/parquet-mr/pull/1026#discussion_r1108635269
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parquet-hadoop/src/main/java/org/apache/parquet/hadoop/rewrite/RewriteOptions.java:
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@@ -101,37 +103,121 @@ public static class Builder {
private List<String> encryptColumns;
private FileEncryptionProperties fileEncryptionProperties;
+ /**
+ * Create a builder to create a RewriterOptions.
+ *
+ * @param conf configuration for reading from input files and
writing to output file
+ * @param inputFile input file path to read from
+ * @param outputFile output file path to rewrite to
+ */
public Builder(Configuration conf, Path inputFile, Path outputFile) {
this.conf = conf;
this.inputFiles = Arrays.asList(inputFile);
this.outputFile = outputFile;
}
+ /**
+ * Create a builder to create a RewriterOptions.
+ * <p>
+ * Please note that if merging more than one file, the schema of all files
must be the same.
+ * Otherwise, the rewrite will fail.
+ * <p>
+ * The rewrite will keep original row groups from all input files. This
may not be optimal
Review Comment:
I have added some comment to elaborate the small row group problem. Please
check @gszadovszky
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