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[format]custom parquet parser #10836

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23 changes: 23 additions & 0 deletions paimon-format/src/main/java/org/apache/paimon/format/parquet/ParquetReaderFactory.java
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Original file line number Diff line number Diff line change
Expand Up @@ -28,6 +28,7 @@
import org.apache.paimon.format.FormatMetadataUtils;
import org.apache.paimon.format.FormatReaderFactory;
import org.apache.paimon.format.parquet.ParquetListLayoutResolver.LayoutContext;
import org.apache.paimon.format.parquet.metadata.SelectiveFooterParser;
import org.apache.paimon.format.parquet.reader.VectorizedParquetRecordReader;
import org.apache.paimon.format.parquet.type.ParquetField;
import org.apache.paimon.format.shredding.ShreddingFormatReader;
Expand Down Expand Up @@ -247,6 +248,28 @@ public FileRecordReader<InternalRow> createReader(FormatReaderFactory.Context co
ParquetInputFile.fromPath(context.fileIO(), context.filePath(), context.fileSize());
ParquetReadOptions.Builder readOptionsBuilder =
ParquetUtil.getParquetReadOptionsBuilder(conf).withRange(0, context.fileSize());

// Enable selective footer parsing when no predicates are present.
// This improves performance by only parsing metadata for requested columns.
if (predicates == null || predicates.isEmpty()) {
StringBuilder requestedColumns = new StringBuilder();
for (DataField field : readType.getFields()) {
if (requestedColumns.length() > 0) {
requestedColumns.append(',');
}
requestedColumns.append(field.name());
}
readOptionsBuilder.set(
SelectiveFooterParser.REQUESTED_COLUMNS_KEY, requestedColumns.toString());

// Skip statistics parsing by default for better performance.
// Statistics are only needed for row-group filtering with predicates.
boolean parseStatistics = conf.getBoolean("parquet.footer.parse-statistics", false);
if (!parseStatistics) {
readOptionsBuilder.set(SelectiveFooterParser.SKIP_STATISTICS_KEY, "true");
}
}

ParquetInputStream inputStream = inputFile.newStream();
ParquetMetadata footer =
readFooter(context, inputFile, readOptionsBuilder.build(), inputStream);
Expand Down
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