[SPARK-5683] [SQL] Avoid multiple json generator created #4468
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Test build #27092 has started for PR 4468 at commit
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Test build #27093 has started for PR 4468 at commit
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Test build #27092 has finished for PR 4468 at commit
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Test PASSed. |
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Test build #27093 has finished for PR 4468 at commit
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Test PASSed. |
| iter.map(JsonRDD.rowToJSON(rowSchema, jsonFactory)) | ||
| val writer = new CharArrayWriter() | ||
| // create the Generator without separator inserted between 2 records | ||
| val gen = new JsonFactory().createGenerator(writer).setRootValueSeparator(null) |
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Should we expect any test result change after using setRootValueSeparator(null)?
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A (single space) will be inserted between 2 json records (in string) by default;
Previously, we create thegeneratorobject for each of record in serialization, hence it's OK with default object separator.
However, in this PR, we are trying to using a singlegenerator for all of the records, that's why we need to set it as null, which means nothing will be inserted between records.
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@chenghao-intel Thank you for the PR. It will be great if you can also attach some performance results. |
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@yhuai, thanks for reviewing, in a local testing, it shows about 10-15% performance gain. |
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LGTM |
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@marmbrus any more comment on this? |
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Thanks, merged to master and 1.3 |
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