[SPARK-39627][SQL] JDBC V2 pushdown should unify the compile API by beliefer · Pull Request #37047 · apache/spark

beliefer · 2022-07-01T11:19:00Z

What changes were proposed in this pull request?

Currently, JdbcDialect have two API compileAggregate and compileExpression, we can unify them.

Why are the changes needed?

Improve ease of use.

Does this PR introduce any user-facing change?

'No'.
The two API compileAggregate call compileExpression not changed.

How was this patch tested?

N/A

beliefer · 2022-07-04T07:16:39Z

ping @huaxingao cc @cloud-fan

cloud-fan · 2022-07-05T06:26:55Z

sql/catalyst/src/main/java/org/apache/spark/sql/connector/util/V2ExpressionSQLBuilder.java

can we move them to near else if (expr instanceof GeneralAggregateFunc)?

cloud-fan · 2022-07-05T06:28:04Z

sql/catalyst/src/main/java/org/apache/spark/sql/connector/util/V2ExpressionSQLBuilder.java

why should it fail by default? it's not user defined.

cloud-fan · 2022-07-05T07:57:28Z

sql/catalyst/src/main/java/org/apache/spark/sql/connector/util/V2ExpressionSQLBuilder.java

shall we just have a single visitAggregateFunction?

cloud-fan · 2022-07-05T07:58:20Z

sql/core/src/main/scala/org/apache/spark/sql/jdbc/DB2Dialect.scala

shall we update JDBCSQLBuilder to respect supportedFunctions in visitAggregateFunction?

JDBCSQLBuilder already check supportedFunctions.

cloud-fan · 2022-07-05T08:53:25Z

sql/core/src/main/scala/org/apache/spark/sql/jdbc/JdbcDialects.scala

shall we apply this in visitSQLFunction?

cloud-fan · 2022-07-05T08:54:00Z

sql/core/src/main/scala/org/apache/spark/sql/jdbc/JdbcDialects.scala

can we deprecate it?

cloud-fan · 2022-07-07T14:38:40Z

sql/core/src/main/scala/org/apache/spark/sql/jdbc/JdbcDialects.scala

This is a bit verbose. Can we make dialectFunctionName return string directly with default implementation

protected def dialectFunctionName(funcName: String): String = String

cloud-fan

LGTM except for one minor comment

cloud-fan · 2022-07-08T03:35:35Z

it has conflicts now...

beliefer · 2022-07-08T04:31:26Z

it has conflicts now...

I see.

cloud-fan · 2022-07-08T07:37:54Z

thanks, merging to master!

beliefer · 2022-07-08T07:39:25Z

@cloud-fan Thank you very much !

### What changes were proposed in this pull request? Currently, `JdbcDialect` have two API `compileAggregate` and `compileExpression`, we can unify them. ### Why are the changes needed? Improve ease of use. ### Does this PR introduce _any_ user-facing change? 'No'. The two API `compileAggregate` call `compileExpression` not changed. ### How was this patch tested? N/A Closes apache#37047 from beliefer/SPARK-39627. Authored-by: Jiaan Geng <beliefer@163.com> Signed-off-by: Wenchen Fan <wenchen@databricks.com>

…LIMIT (#505) * [SPARK-39139][SQL] DS V2 supports push down DS V2 UDF ### What changes were proposed in this pull request? Currently, Spark DS V2 push-down framework supports push down SQL to data sources. But the DS V2 push-down framework only support push down the built-in functions to data sources. Each database have a lot very useful functions which not supported by Spark. If we can push down these functions into data source, it will reduce disk I/O and network I/O and improve the performance when query databases. ### Why are the changes needed? 1. Spark can leverage the functions supported by databases 2. Improve the query performance. ### Does this PR introduce _any_ user-facing change? 'No'. New feature. ### How was this patch tested? New tests. Closes apache#36593 from beliefer/SPARK-39139. Authored-by: Jiaan Geng <beliefer@163.com> Signed-off-by: Wenchen Fan <wenchen@databricks.com> * [SPARK-39453][SQL][TESTS][FOLLOWUP] Let `RAND` in filter is more meaningful ### What changes were proposed in this pull request? apache#36830 makes DS V2 supports push down misc non-aggregate functions(non ANSI). But he `Rand` in test case looks no meaningful. ### Why are the changes needed? Let `Rand` in filter is more meaningful. ### Does this PR introduce _any_ user-facing change? 'No'. Just update test case. ### How was this patch tested? Just update test case. Closes apache#37033 from beliefer/SPARK-39453_followup. Authored-by: Jiaan Geng <beliefer@163.com> Signed-off-by: Wenchen Fan <wenchen@databricks.com> * [SPARK-37527][SQL][FOLLOWUP] Cannot compile COVAR_POP, COVAR_SAMP and CORR in `H2Dialect` if them with `DISTINCT` ### What changes were proposed in this pull request? apache#35145 compile COVAR_POP, COVAR_SAMP and CORR in H2Dialect. Because H2 does't support COVAR_POP, COVAR_SAMP and CORR works with DISTINCT. So apache#35145 introduces a bug that compile COVAR_POP, COVAR_SAMP and CORR if these aggregate functions with DISTINCT. ### Why are the changes needed? Fix bug that compile COVAR_POP, COVAR_SAMP and CORR if these aggregate functions with DISTINCT. ### Does this PR introduce _any_ user-facing change? 'Yes'. Bug will be fix. ### How was this patch tested? New test cases. Closes apache#37090 from beliefer/SPARK-37527_followup2. Authored-by: Jiaan Geng <beliefer@163.com> Signed-off-by: Wenchen Fan <wenchen@databricks.com> * [SPARK-39627][SQL] DS V2 pushdown should unify the compile API ### What changes were proposed in this pull request? Currently, `JdbcDialect` have two API `compileAggregate` and `compileExpression`, we can unify them. ### Why are the changes needed? Improve ease of use. ### Does this PR introduce _any_ user-facing change? 'No'. The two API `compileAggregate` call `compileExpression` not changed. ### How was this patch tested? N/A Closes apache#37047 from beliefer/SPARK-39627. Authored-by: Jiaan Geng <beliefer@163.com> Signed-off-by: Wenchen Fan <wenchen@databricks.com> * [SPARK-39384][SQL] Compile built-in linear regression aggregate functions for JDBC dialect ### What changes were proposed in this pull request? Recently, Spark DS V2 pushdown framework translate a lot of standard linear regression aggregate functions. Currently, only H2Dialect compile these standard linear regression aggregate functions. This PR compile these standard linear regression aggregate functions for other build-in JDBC dialect. ### Why are the changes needed? Make build-in JDBC dialect support compile linear regression aggregate push-down. ### Does this PR introduce _any_ user-facing change? 'No'. New feature. ### How was this patch tested? New test cases. Closes apache#37188 from beliefer/SPARK-39384. Authored-by: Jiaan Geng <beliefer@163.com> Signed-off-by: Sean Owen <srowen@gmail.com> * [SPARK-39148][SQL] DS V2 aggregate push down can work with OFFSET or LIMIT ### What changes were proposed in this pull request? This PR refactors the v2 agg pushdown code. The main change is, now we don't build the `Scan` immediately when pushing agg. We did it so before because we want to know the data schema with agg pushed, then we can add cast when rewriting the query plan after pushdown. But the problem is, we build `Scan` too early and can't push down any more operators, while it's common to see LIMIT/OFFSET after agg. The idea of the refactor is, we don't need to know the data schema with agg pushed. We just give an expectation (the data type should be the same of Spark agg functions), use it to define the output of `ScanBuilderHolder`, and then rewrite the query plan. Later on, when we build the `Scan` and replace `ScanBuilderHolder` with `DataSourceV2ScanRelation`, we check the actual data schema and add a `Project` to do type cast if necessary. ### Why are the changes needed? support pushing down LIMIT/OFFSET after agg. ### Does this PR introduce _any_ user-facing change? no ### How was this patch tested? updated tests Closes apache#37195 from cloud-fan/agg. Lead-authored-by: Wenchen Fan <wenchen@databricks.com> Co-authored-by: Wenchen Fan <cloud0fan@gmail.com> Signed-off-by: Wenchen Fan <wenchen@databricks.com> Co-authored-by: Jiaan Geng <beliefer@163.com> Co-authored-by: Wenchen Fan <wenchen@databricks.com> Co-authored-by: Wenchen Fan <cloud0fan@gmail.com>

…LIMIT (Kyligence#505) * [SPARK-39139][SQL] DS V2 supports push down DS V2 UDF ### What changes were proposed in this pull request? Currently, Spark DS V2 push-down framework supports push down SQL to data sources. But the DS V2 push-down framework only support push down the built-in functions to data sources. Each database have a lot very useful functions which not supported by Spark. If we can push down these functions into data source, it will reduce disk I/O and network I/O and improve the performance when query databases. ### Why are the changes needed? 1. Spark can leverage the functions supported by databases 2. Improve the query performance. ### Does this PR introduce _any_ user-facing change? 'No'. New feature. ### How was this patch tested? New tests. Closes apache#36593 from beliefer/SPARK-39139. Authored-by: Jiaan Geng <beliefer@163.com> Signed-off-by: Wenchen Fan <wenchen@databricks.com> * [SPARK-39453][SQL][TESTS][FOLLOWUP] Let `RAND` in filter is more meaningful ### What changes were proposed in this pull request? apache#36830 makes DS V2 supports push down misc non-aggregate functions(non ANSI). But he `Rand` in test case looks no meaningful. ### Why are the changes needed? Let `Rand` in filter is more meaningful. ### Does this PR introduce _any_ user-facing change? 'No'. Just update test case. ### How was this patch tested? Just update test case. Closes apache#37033 from beliefer/SPARK-39453_followup. Authored-by: Jiaan Geng <beliefer@163.com> Signed-off-by: Wenchen Fan <wenchen@databricks.com> * [SPARK-37527][SQL][FOLLOWUP] Cannot compile COVAR_POP, COVAR_SAMP and CORR in `H2Dialect` if them with `DISTINCT` ### What changes were proposed in this pull request? apache#35145 compile COVAR_POP, COVAR_SAMP and CORR in H2Dialect. Because H2 does't support COVAR_POP, COVAR_SAMP and CORR works with DISTINCT. So apache#35145 introduces a bug that compile COVAR_POP, COVAR_SAMP and CORR if these aggregate functions with DISTINCT. ### Why are the changes needed? Fix bug that compile COVAR_POP, COVAR_SAMP and CORR if these aggregate functions with DISTINCT. ### Does this PR introduce _any_ user-facing change? 'Yes'. Bug will be fix. ### How was this patch tested? New test cases. Closes apache#37090 from beliefer/SPARK-37527_followup2. Authored-by: Jiaan Geng <beliefer@163.com> Signed-off-by: Wenchen Fan <wenchen@databricks.com> * [SPARK-39627][SQL] DS V2 pushdown should unify the compile API ### What changes were proposed in this pull request? Currently, `JdbcDialect` have two API `compileAggregate` and `compileExpression`, we can unify them. ### Why are the changes needed? Improve ease of use. ### Does this PR introduce _any_ user-facing change? 'No'. The two API `compileAggregate` call `compileExpression` not changed. ### How was this patch tested? N/A Closes apache#37047 from beliefer/SPARK-39627. Authored-by: Jiaan Geng <beliefer@163.com> Signed-off-by: Wenchen Fan <wenchen@databricks.com> * [SPARK-39384][SQL] Compile built-in linear regression aggregate functions for JDBC dialect ### What changes were proposed in this pull request? Recently, Spark DS V2 pushdown framework translate a lot of standard linear regression aggregate functions. Currently, only H2Dialect compile these standard linear regression aggregate functions. This PR compile these standard linear regression aggregate functions for other build-in JDBC dialect. ### Why are the changes needed? Make build-in JDBC dialect support compile linear regression aggregate push-down. ### Does this PR introduce _any_ user-facing change? 'No'. New feature. ### How was this patch tested? New test cases. Closes apache#37188 from beliefer/SPARK-39384. Authored-by: Jiaan Geng <beliefer@163.com> Signed-off-by: Sean Owen <srowen@gmail.com> * [SPARK-39148][SQL] DS V2 aggregate push down can work with OFFSET or LIMIT ### What changes were proposed in this pull request? This PR refactors the v2 agg pushdown code. The main change is, now we don't build the `Scan` immediately when pushing agg. We did it so before because we want to know the data schema with agg pushed, then we can add cast when rewriting the query plan after pushdown. But the problem is, we build `Scan` too early and can't push down any more operators, while it's common to see LIMIT/OFFSET after agg. The idea of the refactor is, we don't need to know the data schema with agg pushed. We just give an expectation (the data type should be the same of Spark agg functions), use it to define the output of `ScanBuilderHolder`, and then rewrite the query plan. Later on, when we build the `Scan` and replace `ScanBuilderHolder` with `DataSourceV2ScanRelation`, we check the actual data schema and add a `Project` to do type cast if necessary. ### Why are the changes needed? support pushing down LIMIT/OFFSET after agg. ### Does this PR introduce _any_ user-facing change? no ### How was this patch tested? updated tests Closes apache#37195 from cloud-fan/agg. Lead-authored-by: Wenchen Fan <wenchen@databricks.com> Co-authored-by: Wenchen Fan <cloud0fan@gmail.com> Signed-off-by: Wenchen Fan <wenchen@databricks.com> Co-authored-by: Jiaan Geng <beliefer@163.com> Co-authored-by: Wenchen Fan <wenchen@databricks.com> Co-authored-by: Wenchen Fan <cloud0fan@gmail.com>

…LIMIT (#505) * [SPARK-39139][SQL] DS V2 supports push down DS V2 UDF ### What changes were proposed in this pull request? Currently, Spark DS V2 push-down framework supports push down SQL to data sources. But the DS V2 push-down framework only support push down the built-in functions to data sources. Each database have a lot very useful functions which not supported by Spark. If we can push down these functions into data source, it will reduce disk I/O and network I/O and improve the performance when query databases. ### Why are the changes needed? 1. Spark can leverage the functions supported by databases 2. Improve the query performance. ### Does this PR introduce _any_ user-facing change? 'No'. New feature. ### How was this patch tested? New tests. Closes apache#36593 from beliefer/SPARK-39139. Authored-by: Jiaan Geng <beliefer@163.com> Signed-off-by: Wenchen Fan <wenchen@databricks.com> * [SPARK-39453][SQL][TESTS][FOLLOWUP] Let `RAND` in filter is more meaningful ### What changes were proposed in this pull request? apache#36830 makes DS V2 supports push down misc non-aggregate functions(non ANSI). But he `Rand` in test case looks no meaningful. ### Why are the changes needed? Let `Rand` in filter is more meaningful. ### Does this PR introduce _any_ user-facing change? 'No'. Just update test case. ### How was this patch tested? Just update test case. Closes apache#37033 from beliefer/SPARK-39453_followup. Authored-by: Jiaan Geng <beliefer@163.com> Signed-off-by: Wenchen Fan <wenchen@databricks.com> * [SPARK-37527][SQL][FOLLOWUP] Cannot compile COVAR_POP, COVAR_SAMP and CORR in `H2Dialect` if them with `DISTINCT` ### What changes were proposed in this pull request? apache#35145 compile COVAR_POP, COVAR_SAMP and CORR in H2Dialect. Because H2 does't support COVAR_POP, COVAR_SAMP and CORR works with DISTINCT. So apache#35145 introduces a bug that compile COVAR_POP, COVAR_SAMP and CORR if these aggregate functions with DISTINCT. ### Why are the changes needed? Fix bug that compile COVAR_POP, COVAR_SAMP and CORR if these aggregate functions with DISTINCT. ### Does this PR introduce _any_ user-facing change? 'Yes'. Bug will be fix. ### How was this patch tested? New test cases. Closes apache#37090 from beliefer/SPARK-37527_followup2. Authored-by: Jiaan Geng <beliefer@163.com> Signed-off-by: Wenchen Fan <wenchen@databricks.com> * [SPARK-39627][SQL] DS V2 pushdown should unify the compile API ### What changes were proposed in this pull request? Currently, `JdbcDialect` have two API `compileAggregate` and `compileExpression`, we can unify them. ### Why are the changes needed? Improve ease of use. ### Does this PR introduce _any_ user-facing change? 'No'. The two API `compileAggregate` call `compileExpression` not changed. ### How was this patch tested? N/A Closes apache#37047 from beliefer/SPARK-39627. Authored-by: Jiaan Geng <beliefer@163.com> Signed-off-by: Wenchen Fan <wenchen@databricks.com> * [SPARK-39384][SQL] Compile built-in linear regression aggregate functions for JDBC dialect ### What changes were proposed in this pull request? Recently, Spark DS V2 pushdown framework translate a lot of standard linear regression aggregate functions. Currently, only H2Dialect compile these standard linear regression aggregate functions. This PR compile these standard linear regression aggregate functions for other build-in JDBC dialect. ### Why are the changes needed? Make build-in JDBC dialect support compile linear regression aggregate push-down. ### Does this PR introduce _any_ user-facing change? 'No'. New feature. ### How was this patch tested? New test cases. Closes apache#37188 from beliefer/SPARK-39384. Authored-by: Jiaan Geng <beliefer@163.com> Signed-off-by: Sean Owen <srowen@gmail.com> * [SPARK-39148][SQL] DS V2 aggregate push down can work with OFFSET or LIMIT ### What changes were proposed in this pull request? This PR refactors the v2 agg pushdown code. The main change is, now we don't build the `Scan` immediately when pushing agg. We did it so before because we want to know the data schema with agg pushed, then we can add cast when rewriting the query plan after pushdown. But the problem is, we build `Scan` too early and can't push down any more operators, while it's common to see LIMIT/OFFSET after agg. The idea of the refactor is, we don't need to know the data schema with agg pushed. We just give an expectation (the data type should be the same of Spark agg functions), use it to define the output of `ScanBuilderHolder`, and then rewrite the query plan. Later on, when we build the `Scan` and replace `ScanBuilderHolder` with `DataSourceV2ScanRelation`, we check the actual data schema and add a `Project` to do type cast if necessary. ### Why are the changes needed? support pushing down LIMIT/OFFSET after agg. ### Does this PR introduce _any_ user-facing change? no ### How was this patch tested? updated tests Closes apache#37195 from cloud-fan/agg. Lead-authored-by: Wenchen Fan <wenchen@databricks.com> Co-authored-by: Wenchen Fan <cloud0fan@gmail.com> Signed-off-by: Wenchen Fan <wenchen@databricks.com> Co-authored-by: Jiaan Geng <beliefer@163.com> Co-authored-by: Wenchen Fan <wenchen@databricks.com> Co-authored-by: Wenchen Fan <cloud0fan@gmail.com>

…LIMIT (#505) * [SPARK-39139][SQL] DS V2 supports push down DS V2 UDF Currently, Spark DS V2 push-down framework supports push down SQL to data sources. But the DS V2 push-down framework only support push down the built-in functions to data sources. Each database have a lot very useful functions which not supported by Spark. If we can push down these functions into data source, it will reduce disk I/O and network I/O and improve the performance when query databases. 1. Spark can leverage the functions supported by databases 2. Improve the query performance. 'No'. New feature. New tests. Closes apache#36593 from beliefer/SPARK-39139. Authored-by: Jiaan Geng <beliefer@163.com> Signed-off-by: Wenchen Fan <wenchen@databricks.com> * [SPARK-39453][SQL][TESTS][FOLLOWUP] Let `RAND` in filter is more meaningful apache#36830 makes DS V2 supports push down misc non-aggregate functions(non ANSI). But he `Rand` in test case looks no meaningful. Let `Rand` in filter is more meaningful. 'No'. Just update test case. Just update test case. Closes apache#37033 from beliefer/SPARK-39453_followup. Authored-by: Jiaan Geng <beliefer@163.com> Signed-off-by: Wenchen Fan <wenchen@databricks.com> * [SPARK-37527][SQL][FOLLOWUP] Cannot compile COVAR_POP, COVAR_SAMP and CORR in `H2Dialect` if them with `DISTINCT` apache#35145 compile COVAR_POP, COVAR_SAMP and CORR in H2Dialect. Because H2 does't support COVAR_POP, COVAR_SAMP and CORR works with DISTINCT. So apache#35145 introduces a bug that compile COVAR_POP, COVAR_SAMP and CORR if these aggregate functions with DISTINCT. Fix bug that compile COVAR_POP, COVAR_SAMP and CORR if these aggregate functions with DISTINCT. 'Yes'. Bug will be fix. New test cases. Closes apache#37090 from beliefer/SPARK-37527_followup2. Authored-by: Jiaan Geng <beliefer@163.com> Signed-off-by: Wenchen Fan <wenchen@databricks.com> * [SPARK-39627][SQL] DS V2 pushdown should unify the compile API Currently, `JdbcDialect` have two API `compileAggregate` and `compileExpression`, we can unify them. Improve ease of use. 'No'. The two API `compileAggregate` call `compileExpression` not changed. N/A Closes apache#37047 from beliefer/SPARK-39627. Authored-by: Jiaan Geng <beliefer@163.com> Signed-off-by: Wenchen Fan <wenchen@databricks.com> * [SPARK-39384][SQL] Compile built-in linear regression aggregate functions for JDBC dialect Recently, Spark DS V2 pushdown framework translate a lot of standard linear regression aggregate functions. Currently, only H2Dialect compile these standard linear regression aggregate functions. This PR compile these standard linear regression aggregate functions for other build-in JDBC dialect. Make build-in JDBC dialect support compile linear regression aggregate push-down. 'No'. New feature. New test cases. Closes apache#37188 from beliefer/SPARK-39384. Authored-by: Jiaan Geng <beliefer@163.com> Signed-off-by: Sean Owen <srowen@gmail.com> * [SPARK-39148][SQL] DS V2 aggregate push down can work with OFFSET or LIMIT This PR refactors the v2 agg pushdown code. The main change is, now we don't build the `Scan` immediately when pushing agg. We did it so before because we want to know the data schema with agg pushed, then we can add cast when rewriting the query plan after pushdown. But the problem is, we build `Scan` too early and can't push down any more operators, while it's common to see LIMIT/OFFSET after agg. The idea of the refactor is, we don't need to know the data schema with agg pushed. We just give an expectation (the data type should be the same of Spark agg functions), use it to define the output of `ScanBuilderHolder`, and then rewrite the query plan. Later on, when we build the `Scan` and replace `ScanBuilderHolder` with `DataSourceV2ScanRelation`, we check the actual data schema and add a `Project` to do type cast if necessary. support pushing down LIMIT/OFFSET after agg. no updated tests Closes apache#37195 from cloud-fan/agg. Lead-authored-by: Wenchen Fan <wenchen@databricks.com> Co-authored-by: Wenchen Fan <cloud0fan@gmail.com> Signed-off-by: Wenchen Fan <wenchen@databricks.com> Co-authored-by: Jiaan Geng <beliefer@163.com> Co-authored-by: Wenchen Fan <wenchen@databricks.com> Co-authored-by: Wenchen Fan <cloud0fan@gmail.com>

github-actions bot added the SQL label Jul 1, 2022

beliefer changed the title ~~[SPARK-39627][SQL] Unify compileAggregate and compileExpression in JdbcDialect~~ [WIP][SPARK-39627][SQL] Unify compileAggregate and compileExpression in JdbcDialect Jul 1, 2022

beliefer changed the title ~~[WIP][SPARK-39627][SQL] Unify compileAggregate and compileExpression in JdbcDialect~~ [WIP][SPARK-39627][SQL] DS V2 pushdown should unify the compile API Jul 4, 2022

beliefer changed the title ~~[WIP][SPARK-39627][SQL] DS V2 pushdown should unify the compile API~~ [SPARK-39627][SQL] DS V2 pushdown should unify the compile API Jul 4, 2022

cloud-fan reviewed Jul 5, 2022

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beliefer force-pushed the SPARK-39627 branch from e1270d5 to 65e73c7 Compare July 7, 2022 02:55

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beliefer force-pushed the SPARK-39627 branch from 65e73c7 to 22832cb Compare July 8, 2022 02:46

beliefer added 12 commits July 8, 2022 12:16

[SPARK-39627][SQL] Unify compileAggregate and compileExpression

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beliefer force-pushed the SPARK-39627 branch from 22832cb to 3cb1a7e Compare July 8, 2022 04:27

cloud-fan closed this in 7a4b93d Jul 8, 2022

cloud-fan changed the title ~~[SPARK-39627][SQL] DS V2 pushdown should unify the compile API~~ [SPARK-39627][SQL] JDBC V2 pushdown should unify the compile API Jul 8, 2022

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beliefer commented Jul 1, 2022

What changes were proposed in this pull request?

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