wgtmac commented on code in PR #1026:
URL: https://github.com/apache/parquet-mr/pull/1026#discussion_r1105191438
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parquet-hadoop/src/main/java/org/apache/parquet/hadoop/rewrite/ParquetRewriter.java:
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@@ -183,12 +186,61 @@ public ParquetRewriter(TransParquetFileReader reader,
}
}
+ // Open all input files to validate their schemas are compatible to merge
+ private void openInputFiles(List<Path> inputFiles, Configuration conf) {
+ Preconditions.checkArgument(inputFiles != null && !inputFiles.isEmpty(),
"No input files");
+
+ for (Path inputFile : inputFiles) {
+ try {
+ TransParquetFileReader reader = new TransParquetFileReader(
+ HadoopInputFile.fromPath(inputFile, conf),
HadoopReadOptions.builder(conf).build());
+ MessageType inputFileSchema =
reader.getFooter().getFileMetaData().getSchema();
+ if (this.schema == null) {
+ this.schema = inputFileSchema;
+ } else {
+ // Now we enforce equality of schemas from input files for
simplicity.
+ if (!this.schema.equals(inputFileSchema)) {
+ throw new InvalidSchemaException("Input files have different
schemas");
+ }
+ }
+
this.allOriginalCreatedBys.add(reader.getFooter().getFileMetaData().getCreatedBy());
+ this.inputFiles.add(reader);
+ } catch (IOException e) {
+ throw new IllegalArgumentException("Failed to open input file: " +
inputFile, e);
+ }
+ }
+
+ extraMetaData.put(ORIGINAL_CREATED_BY_KEY, String.join("\n",
allOriginalCreatedBys));
Review Comment:
> Do we do dedup?
Yes, `allOriginalCreatedBys` is a HashSet which does the job.
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