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https://issues.apache.org/jira/browse/SPARK-34108?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chao Sun updated SPARK-34108:
-----------------------------
Description:
Currently, caching a permanent view doesn't work in some cases. For instance,
in the following:
{code:sql}
CREATE TABLE t (key bigint, value string) USING parquet
CREATE VIEW v1 AS SELECT key FROM t
CACHE TABLE v1
SELECT key FROM t
{code}
The last SELECT query will hit the cached {{v1}}. However, in the following:
{code:sql}
CREATE TABLE t (key bigint, value string) USING parquet
CREATE VIEW v1 AS SELECT key FROM t ORDER by key
CACHE TABLE v1
SELECT key FROM t ORDER BY key
{code}
The SELECT won't hit the cache.
It seems this is related to {{EliminateView}}. In the second case, it will
insert an extra project operator which makes the comparison on canonicalized
plan during cache lookup fail.
was:
Currently, caching a permanent view doesn't work in some cases. For instance,
in the following:
{code}
CREATE TABLE t (key bigint, value string) USING parquet
CREATE VIEW v1 AS SELECT key FROM t
CACHE TABLE v1
SELECT key FROM t
{code}
The last SELECT query will hit the cached {{v1}}. However, in the following:
{code}
CREATE TABLE t (key bigint, value string) USING parquet
CREATE VIEW v1 AS SELECT key FROM t ORDER by key
CACHE TABLE v1
SELECT key FROM t ORDER BY key
{code}
The SELECT won't hit the cache.
It seems this is related to {{EliminateView}}. In the second case, it will
insert an extra project operator which makes the comparison on canonicalized
plan during cache lookup fail.
> Caching doesn't work completely with permanent view
> ---------------------------------------------------
>
> Key: SPARK-34108
> URL: https://issues.apache.org/jira/browse/SPARK-34108
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 3.1.0
> Reporter: Chao Sun
> Priority: Major
>
> Currently, caching a permanent view doesn't work in some cases. For instance,
> in the following:
> {code:sql}
> CREATE TABLE t (key bigint, value string) USING parquet
> CREATE VIEW v1 AS SELECT key FROM t
> CACHE TABLE v1
> SELECT key FROM t
> {code}
> The last SELECT query will hit the cached {{v1}}. However, in the following:
> {code:sql}
> CREATE TABLE t (key bigint, value string) USING parquet
> CREATE VIEW v1 AS SELECT key FROM t ORDER by key
> CACHE TABLE v1
> SELECT key FROM t ORDER BY key
> {code}
> The SELECT won't hit the cache.
> It seems this is related to {{EliminateView}}. In the second case, it will
> insert an extra project operator which makes the comparison on canonicalized
> plan during cache lookup fail.
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