Alex Pelagenko

fix(core): fix OOM on start caused by O3 purge backglog

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When `sys.column_versions_purge_log ` table has too many unprocessed records QuestDB can fail to start with Out Of Memory error while trying to re-schedule column purges. Limit the number of records...

add UFS (0x35) to supported file system

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Add UFS code 0x35 to list of supported file systems

Attach partitions as soft links to directories from different drive

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### Is your feature request related to a problem? It's useful to support tables with partition located on different physical (network) drives attached to the same box. QuestDB should support...

feat(core): data deduplication

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Related https://github.com/questdb/roadmap/issues/3 This PR adds functionality to enable insert deduplication on the storage level. With the syntax as ```SQL CREATE TABLE no_ts_dups_table (timestamp ts, l long) timestamps(ts) PARTITION BY DAY...

### Describe the bug QuestDB server stop / throws unhandled exception after these steps: ``` docker run -p 9000:9000 -v /tmp/questest:/var/lib/questdb questdb/questdb:7.1.3 ``` server.conf: ``` http.allow.deflate.before.send=true ``` after the server...

Create a way to change SYMBOL column capacity

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### Is your feature request related to a problem? When symbols are created automatically from ILP they use the default CAPACITY of 256. When this is too low, the insertion...

Hash join assertion error

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### Describe the bug Memory bound assertion error generated for a hash join on string field, here is relevant piece of log ``` 2021-12-10T08:50:45.842027Z I i.q.c.p.PGConnectionContext parse [fd=17, q=SELECT result.TABLE_CAT,...

Support multiple column drop for WAL tables

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### Describe the bug WAL tables do not support multiple column drop in 1 statement ``` alter table test drop COLUMN col3, col5; ``` It will be beneficial if WAL...

feat(core): support WAL sequencer transaction file partitioned format

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WAL sequencer file `_txnlog` records all 28 bytes per transaction and currently there is no way to reduce the space taken by this file. This can add up to many...

### To reproduce Invalid drop partition statement suspended WAL table ``` ALTER TABLE p DROP PARTITION LIST '2000', position=56, error='yyyy-MM-dd' expected, found [ts=2000], errno=-1] C i.q.c.w.ApplyWal2TableJob job failed, table suspended...