PARQUET-84: Avoid reading rowgroup metadata in memory on the client side. #45
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fix comment: [ startOffset, endOffset )
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LGTM! |
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@tsdeng and the build is green! |
tongjiechen
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Oct 8, 2014
…ide. This will improve reading big datasets with a large schema (thousands of columns) Instead rowgroup metadata can be read in the tasks where each tasks reads only the metadata of the file it's reading Author: julien <julien@twitter.com> Closes apache#45 from julienledem/skip_reading_row_groups and squashes the following commits: ccdd08c [julien] fix parquet-hive 24a2050 [julien] Merge branch 'master' into skip_reading_row_groups 3d7e35a [julien] adress review feedback 5b6bd1b [julien] more tests 323d254 [julien] sdd unit tests f599259 [julien] review feedback fb11f02 [julien] fix backward compatibility check 2c20b46 [julien] cleanup readFooters methods 3da37d8 [julien] fix read summary ab95a45 [julien] cleanup 4d16df3 [julien] implement task side metadata 9bb8059 [julien] first stab at integrating skipping row groups
rdblue
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Feb 6, 2015
…ide. This will improve reading big datasets with a large schema (thousands of columns) Instead rowgroup metadata can be read in the tasks where each tasks reads only the metadata of the file it's reading Author: julien <julien@twitter.com> Closes apache#45 from julienledem/skip_reading_row_groups and squashes the following commits: ccdd08c [julien] fix parquet-hive 24a2050 [julien] Merge branch 'master' into skip_reading_row_groups 3d7e35a [julien] adress review feedback 5b6bd1b [julien] more tests 323d254 [julien] sdd unit tests f599259 [julien] review feedback fb11f02 [julien] fix backward compatibility check 2c20b46 [julien] cleanup readFooters methods 3da37d8 [julien] fix read summary ab95a45 [julien] cleanup 4d16df3 [julien] implement task side metadata 9bb8059 [julien] first stab at integrating skipping row groups Conflicts: parquet-hadoop/src/main/java/parquet/hadoop/ParquetFileWriter.java parquet-hadoop/src/main/java/parquet/hadoop/ParquetInputFormat.java parquet-hadoop/src/test/java/parquet/hadoop/example/TestInputOutputFormat.java Resolution: Conflicts were from whitespace changes and strict type checking (not backported). Removed dependence on strict type checking.
rdblue
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Mar 9, 2015
…ide. This will improve reading big datasets with a large schema (thousands of columns) Instead rowgroup metadata can be read in the tasks where each tasks reads only the metadata of the file it's reading Author: julien <julien@twitter.com> Closes apache#45 from julienledem/skip_reading_row_groups and squashes the following commits: ccdd08c [julien] fix parquet-hive 24a2050 [julien] Merge branch 'master' into skip_reading_row_groups 3d7e35a [julien] adress review feedback 5b6bd1b [julien] more tests 323d254 [julien] sdd unit tests f599259 [julien] review feedback fb11f02 [julien] fix backward compatibility check 2c20b46 [julien] cleanup readFooters methods 3da37d8 [julien] fix read summary ab95a45 [julien] cleanup 4d16df3 [julien] implement task side metadata 9bb8059 [julien] first stab at integrating skipping row groups Conflicts: parquet-hadoop/src/main/java/parquet/hadoop/ParquetFileWriter.java parquet-hadoop/src/main/java/parquet/hadoop/ParquetInputFormat.java parquet-hadoop/src/test/java/parquet/hadoop/example/TestInputOutputFormat.java Resolution: Conflicts were from whitespace changes and strict type checking (not backported). Removed dependence on strict type checking.
sunchao
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Aug 1, 2022
apache#43 added the logic to return null when `compressedPages` become empty. However this is not correct with async IO enabled, since the first page may not have been read yet, when the method is called. This fixes it by adding a `isFinished` variable to indicate whether all the pages have been consumed in the `ColumnChunkPageReadStore`. In addition, this also added a few pre-condition checks to make sure the object won't run into some invalid state.
sunchao
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Sep 16, 2022
Follow-up of apache#45. This fixes the pre-condition check of `getPageValueCount` method.
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This will improve reading big datasets with a large schema (thousands of columns)
Instead rowgroup metadata can be read in the tasks where each tasks reads only the metadata of the file it's reading