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From "ASF GitHub Bot (Jira)" <>
Subject [jira] [Updated] (HIVE-25406) Fetch writeId from insert-only transactional tables
Date Thu, 29 Jul 2021 12:11:00 GMT


ASF GitHub Bot updated HIVE-25406:
    Labels: pull-request-available  (was: )

> Fetch writeId from insert-only transactional tables
> ---------------------------------------------------
>                 Key: HIVE-25406
>                 URL:
>             Project: Hive
>          Issue Type: Improvement
>          Components: ORC, Parquet, Reader, Vectorization
>            Reporter: Krisztian Kasa
>            Assignee: Krisztian Kasa
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 10m
>  Remaining Estimate: 0h
> When generating plan for incremental materialized view rebuild a filter operator is inserted
on top of each source table scans. The predicates contain a filter for writeId since we want
to get all the rows inserted/deleted from the source tables since the last rebuild only.
> WriteId is part of the ROW_ID virtual column and only available for fully-ACID ORC tables.
> The goal of this jira is to populate a writeId when fetching from insert-only transactional
> {code:java}
> create table t1(a int, b int) clustered by (a) into 2 buckets stored as orc TBLPROPERTIES
('transactional'='true', 'transactional_properties'='insert_only');
> ...
> SELECT t1.ROW__ID.writeId, a, b FROM t1;
> {code}

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