ConeyLiu commented on code in PR #1273:
URL: https://github.com/apache/parquet-mr/pull/1273#discussion_r1558939543
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parquet-hadoop/src/main/java/org/apache/parquet/hadoop/rewrite/ParquetRewriter.java:
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@@ -137,16 +175,34 @@ public ParquetRewriter(RewriteOptions options) throws
IOException {
getPaths(schema, paths, null);
for (String col : pruneColumns) {
if (!paths.contains(col)) {
- LOG.warn("Input column name {} doesn't show up in the schema of file
{}", col, reader.getFile());
+ LOG.warn("Input column name {} doesn't show up in the schema", col);
}
}
Set<ColumnPath> prunePaths = convertToColumnPaths(pruneColumns);
schema = pruneColumnsInSchema(schema, prunePaths);
}
- this.descriptorsMap =
- schema.getColumns().stream().collect(Collectors.toMap(x ->
ColumnPath.get(x.getPath()), x -> x));
+ if (inputFilesR.isEmpty()) {
+ this.descriptorsMap =
+ schema.getColumns().stream().collect(Collectors.toMap(x ->
ColumnPath.get(x.getPath()), x -> x));
+ } else { // TODO: describe in documentation that only top level column can
be overwritten
+ this.descriptorsMap = schemaL.getColumns().stream()
+ .filter(x -> x.getPath().length == 0 ||
!fieldNamesR.containsKey(x.getPath()[0]))
Review Comment:
So, the left part columns' order could be changed if overwrite occurred.
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