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[GitHub] [spark] yaooqinn opened a new pull request, #37355: [SPARK-39930][SQL] Introduce Cache Hints
yaooqinn opened a new pull request, #37355:
URL: https://github.com/apache/spark/pull/37355
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### What changes were proposed in this pull request?
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This ticket intends to add query hints for cache behaviors, users can perform actions like the use/skip/cache/uncache, etc on the cached results by the following hints.
- RESULT_CACHE: spark will use cache by default, this hint keeps this behavior but will cache the child plan if uncached yet.
- NO_RESULT_CACHE:with this hint, we can skip the default behavior to bypass the cached data if it is cached
- RESULT_UNCACHE: with this hint, we can remove the cached data.
RESULT_CACHE and NO_RESULT_CACHE are borrowed from oracle, FYI,[https://docs.oracle.com/database/121/TGDBA/tune_result_cache.htm#TGDBA647.](https://docs.oracle.com/database/121/TGDBA/tune_result_cache.htm#TGDBA647), while RESULT_UNCACHE's added accordingly via the naming rule.
Similar ideas can also be found in MySQL, FYI https://dev.mysql.com/doc/refman/5.7/en/query-cache-in-select.html
Maybe we can add more cache hints like RESULT_RECACHE to refresh the cached data, or maybe some cache behaviors that relate to metadata.
### Why are the changes needed?
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As a supplement for CACHE/UNCACHE commands, pure SQL users can operate the cache in their queries directly without extra definitions. Also, cache skipping is supported by hints.
### Does this PR introduce _any_ user-facing change?
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yes, this PR brings some new hints
### How was this patch tested?
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- new tests for ut
- test dist by hand
<img width="1670" alt="image" src="https://user-images.githubusercontent.com/8326978/182107570-38cdb9ca-08e1-4157-8bdd-72a6e361e1f4.png">
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[GitHub] [spark] HyukjinKwon commented on pull request #37355: [SPARK-39930][SQL] Introduce Cache Hints
Posted by GitBox <gi...@apache.org>.
HyukjinKwon commented on PR #37355:
URL: https://github.com/apache/spark/pull/37355#issuecomment-1201980467
I like the idea.
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[GitHub] [spark] yaooqinn commented on pull request #37355: [SPARK-39930][SQL] Introduce Cache Hints
Posted by GitBox <gi...@apache.org>.
yaooqinn commented on PR #37355:
URL: https://github.com/apache/spark/pull/37355#issuecomment-1200896061
cc @cloud-fan @MaxGekk @HyukjinKwon @wangyum, PTAL when you have time.
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[GitHub] [spark] yaooqinn commented on a diff in pull request #37355: [SPARK-39930][SQL] Introduce Cache Hints
Posted by GitBox <gi...@apache.org>.
yaooqinn commented on code in PR #37355:
URL: https://github.com/apache/spark/pull/37355#discussion_r935390148
##########
sql/core/src/test/scala/org/apache/spark/sql/CacheHintsSuite.scala:
##########
@@ -0,0 +1,75 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.spark.sql
+
+import org.apache.spark.sql.catalyst.plans.PlanTest
+import org.apache.spark.sql.execution.CachedData
+import org.apache.spark.sql.execution.analysis.ResolveCacheHints.NO_RESULT_CACHE_TAG
+import org.apache.spark.sql.test.SharedSparkSession
+
+class CacheHintsSuite extends PlanTest with SharedSparkSession {
+ private def lookupCachedData(df: DataFrame): Option[CachedData] = {
+ spark.sharedState.cacheManager.lookupCachedData(df)
+ }
+
+ test("RESULT_CACHE Hint") {
+ val e = intercept[AnalysisException](
+ sql("SELECT /*+ RESULT_CACHE(abc) */ id from range(0, 1)").collect())
Review Comment:
oh, i just notice another difference for RESULT_CACHE is to remove the NO_RESULT_CACHE_TAG
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[GitHub] [spark] github-actions[bot] commented on pull request #37355: [SPARK-39930][SQL] Introduce Cache Hints
Posted by GitBox <gi...@apache.org>.
github-actions[bot] commented on PR #37355:
URL: https://github.com/apache/spark/pull/37355#issuecomment-1311073364
We're closing this PR because it hasn't been updated in a while. This isn't a judgement on the merit of the PR in any way. It's just a way of keeping the PR queue manageable.
If you'd like to revive this PR, please reopen it and ask a committer to remove the Stale tag!
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[GitHub] [spark] github-actions[bot] closed pull request #37355: [SPARK-39930][SQL] Introduce Cache Hints
Posted by GitBox <gi...@apache.org>.
github-actions[bot] closed pull request #37355: [SPARK-39930][SQL] Introduce Cache Hints
URL: https://github.com/apache/spark/pull/37355
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[GitHub] [spark] cloud-fan commented on a diff in pull request #37355: [SPARK-39930][SQL] Introduce Cache Hints
Posted by GitBox <gi...@apache.org>.
cloud-fan commented on code in PR #37355:
URL: https://github.com/apache/spark/pull/37355#discussion_r935138416
##########
sql/core/src/test/scala/org/apache/spark/sql/CacheHintsSuite.scala:
##########
@@ -0,0 +1,75 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.spark.sql
+
+import org.apache.spark.sql.catalyst.plans.PlanTest
+import org.apache.spark.sql.execution.CachedData
+import org.apache.spark.sql.execution.analysis.ResolveCacheHints.NO_RESULT_CACHE_TAG
+import org.apache.spark.sql.test.SharedSparkSession
+
+class CacheHintsSuite extends PlanTest with SharedSparkSession {
+ private def lookupCachedData(df: DataFrame): Option[CachedData] = {
+ spark.sharedState.cacheManager.lookupCachedData(df)
+ }
+
+ test("RESULT_CACHE Hint") {
+ val e = intercept[AnalysisException](
+ sql("SELECT /*+ RESULT_CACHE(abc) */ id from range(0, 1)").collect())
Review Comment:
I don't think `CACHE TABLE` command fails if the plan is already cached. So basically the hint is to combine two sql statements?
```
CACHE TABLE abc AS SELECT id from range(0,1)
SELECT * FROM abc
```
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[GitHub] [spark] github-actions[bot] closed pull request #37355: [SPARK-39930][SQL] Introduce Cache Hints
Posted by GitBox <gi...@apache.org>.
github-actions[bot] closed pull request #37355: [SPARK-39930][SQL] Introduce Cache Hints
URL: https://github.com/apache/spark/pull/37355
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[GitHub] [spark] yaooqinn commented on a diff in pull request #37355: [SPARK-39930][SQL] Introduce Cache Hints
Posted by GitBox <gi...@apache.org>.
yaooqinn commented on code in PR #37355:
URL: https://github.com/apache/spark/pull/37355#discussion_r935131842
##########
sql/core/src/test/scala/org/apache/spark/sql/CacheHintsSuite.scala:
##########
@@ -0,0 +1,75 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.spark.sql
+
+import org.apache.spark.sql.catalyst.plans.PlanTest
+import org.apache.spark.sql.execution.CachedData
+import org.apache.spark.sql.execution.analysis.ResolveCacheHints.NO_RESULT_CACHE_TAG
+import org.apache.spark.sql.test.SharedSparkSession
+
+class CacheHintsSuite extends PlanTest with SharedSparkSession {
+ private def lookupCachedData(df: DataFrame): Option[CachedData] = {
+ spark.sharedState.cacheManager.lookupCachedData(df)
+ }
+
+ test("RESULT_CACHE Hint") {
+ val e = intercept[AnalysisException](
+ sql("SELECT /*+ RESULT_CACHE(abc) */ id from range(0, 1)").collect())
Review Comment:
They are very similar with few differences:
1. the result set is not the same
2. it skips caching step when already cached, so it will not fail
Parameters are disabled now because
1. I don't know if it is good to do parsing table identifiers in post-resolution
2. oracle does not have params support either, maybe it's simple and easy for users？
3. minimize the patch size
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[GitHub] [spark] yaooqinn commented on a diff in pull request #37355: [SPARK-39930][SQL] Introduce Cache Hints
Posted by GitBox <gi...@apache.org>.
yaooqinn commented on code in PR #37355:
URL: https://github.com/apache/spark/pull/37355#discussion_r935255014
##########
sql/core/src/test/scala/org/apache/spark/sql/CacheHintsSuite.scala:
##########
@@ -0,0 +1,75 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.spark.sql
+
+import org.apache.spark.sql.catalyst.plans.PlanTest
+import org.apache.spark.sql.execution.CachedData
+import org.apache.spark.sql.execution.analysis.ResolveCacheHints.NO_RESULT_CACHE_TAG
+import org.apache.spark.sql.test.SharedSparkSession
+
+class CacheHintsSuite extends PlanTest with SharedSparkSession {
+ private def lookupCachedData(df: DataFrame): Option[CachedData] = {
+ spark.sharedState.cacheManager.lookupCachedData(df)
+ }
+
+ test("RESULT_CACHE Hint") {
+ val e = intercept[AnalysisException](
+ sql("SELECT /*+ RESULT_CACHE(abc) */ id from range(0, 1)").collect())
Review Comment:
a quick test
```sql
CACHE TABLE abc AS SELECT id from range(0,1);
Time taken: 0.673 seconds
spark-sql> CACHE TABLE abc AS SELECT id from range(0,1);
Error in query: Temporary view 'abc' already exists
```
And, yes, the `RESULT_CACHE(abc)` hint basically can be the same as the above 2 SQLs. Maybe with keyword LAZY is more precise.
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[GitHub] [spark] cloud-fan commented on a diff in pull request #37355: [SPARK-39930][SQL] Introduce Cache Hints
Posted by GitBox <gi...@apache.org>.
cloud-fan commented on code in PR #37355:
URL: https://github.com/apache/spark/pull/37355#discussion_r935089294
##########
sql/core/src/test/scala/org/apache/spark/sql/CacheHintsSuite.scala:
##########
@@ -0,0 +1,75 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.spark.sql
+
+import org.apache.spark.sql.catalyst.plans.PlanTest
+import org.apache.spark.sql.execution.CachedData
+import org.apache.spark.sql.execution.analysis.ResolveCacheHints.NO_RESULT_CACHE_TAG
+import org.apache.spark.sql.test.SharedSparkSession
+
+class CacheHintsSuite extends PlanTest with SharedSparkSession {
+ private def lookupCachedData(df: DataFrame): Option[CachedData] = {
+ spark.sharedState.cacheManager.lookupCachedData(df)
+ }
+
+ test("RESULT_CACHE Hint") {
+ val e = intercept[AnalysisException](
+ sql("SELECT /*+ RESULT_CACHE(abc) */ id from range(0, 1)").collect())
Review Comment:
is it the same as `CACHE TABLE abc AS SELECT id from range(0,1)`?
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[GitHub] [spark] yaooqinn commented on a diff in pull request #37355: [SPARK-39930][SQL] Introduce Cache Hints
Posted by GitBox <gi...@apache.org>.
yaooqinn commented on code in PR #37355:
URL: https://github.com/apache/spark/pull/37355#discussion_r935255014
##########
sql/core/src/test/scala/org/apache/spark/sql/CacheHintsSuite.scala:
##########
@@ -0,0 +1,75 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.spark.sql
+
+import org.apache.spark.sql.catalyst.plans.PlanTest
+import org.apache.spark.sql.execution.CachedData
+import org.apache.spark.sql.execution.analysis.ResolveCacheHints.NO_RESULT_CACHE_TAG
+import org.apache.spark.sql.test.SharedSparkSession
+
+class CacheHintsSuite extends PlanTest with SharedSparkSession {
+ private def lookupCachedData(df: DataFrame): Option[CachedData] = {
+ spark.sharedState.cacheManager.lookupCachedData(df)
+ }
+
+ test("RESULT_CACHE Hint") {
+ val e = intercept[AnalysisException](
+ sql("SELECT /*+ RESULT_CACHE(abc) */ id from range(0, 1)").collect())
Review Comment:
a quick test
```sql
CACHE TABLE abc AS SELECT id from range(0,1);
Time taken: 0.673 seconds
spark-sql> CACHE TABLE abc AS SELECT id from range(0,1);
Error in query: Temporary view 'abc' already exists
```
And, yes, the RESULT_CACHE hint basically the same as the above 2 SQLs. Maybe with keyword LAZY is more precise.
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[GitHub] [spark] cloud-fan commented on pull request #37355: [SPARK-39930][SQL] Introduce Cache Hints
Posted by GitBox <gi...@apache.org>.
cloud-fan commented on PR #37355:
URL: https://github.com/apache/spark/pull/37355#issuecomment-1313002983
To close the loop: `CACHE TABLE abc AS SELECT id from range(0,1)` should be sufficient. If it fails with view already exists, we can either rerun it with a different name, or drop the temp view first.
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[GitHub] [spark] yaooqinn commented on pull request #37355: [SPARK-39930][SQL] Introduce Cache Hints
Posted by GitBox <gi...@apache.org>.
yaooqinn commented on PR #37355:
URL: https://github.com/apache/spark/pull/37355#issuecomment-1314645862
For a multi-tenant scenario like Thrift Server, if we explicitly cache/uncache some plans or relations, it will affect other's request
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