[
https://issues.apache.org/jira/browse/SPARK-33910?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Yuming Wang updated SPARK-33910:
--------------------------------
Description:
Simplify/Optimize conditional expressions. We can improve these cases:
1. Reduce read datasource.
2. Simple CaseWhen/If to support filter push down.
{code:sql}
create table t1 using parquet as select * from range(100);
create table t2 using parquet as select * from range(200);
create temp view v1 as
select 'a' as event_type, * from t1
union all
select CASE WHEN id = 1 THEN 'b' WHEN id = 3 THEN 'c' end as event_type, * from
t2
explain select * from v1 where event_type = 'a';
{code}
Before this PR:
{noformat}
== Physical Plan ==
Union
:- *(1) Project [a AS event_type#30533, id#30535L]
: +- *(1) ColumnarToRow
: +- FileScan parquet default.t1[id#30535L] Batched: true, DataFilters: [],
Format: Parquet
+- *(2) Project [CASE WHEN (id#30536L = 1) THEN b WHEN (id#30536L = 3) THEN c
END AS event_type#30534, id#30536L]
+- *(2) Filter (CASE WHEN (id#30536L = 1) THEN b WHEN (id#30536L = 3) THEN c
END = a)
+- *(2) ColumnarToRow
+- FileScan parquet default.t2[id#30536L] Batched: true, DataFilters:
[(CASE WHEN (id#30536L = 1) THEN b WHEN (id#30536L = 3) THEN c END = a)],
Format: Parquet
{noformat}
After this PR:
{noformat}
== Physical Plan ==
*(1) Project [a AS event_type#8, id#4L]
+- *(1) ColumnarToRow
+- FileScan parquet default.t1[id#4L] Batched: true, DataFilters: [],
Format: Parquet
{noformat}
was:
Simplify CaseWhen/If conditionals. We can improve these cases:
1. Reduce read datasource.
2. Simple CaseWhen/If to support filter push down.
{code:sql}
create table t1 using parquet as select * from range(100);
create table t2 using parquet as select * from range(200);
create temp view v1 as
select 'a' as event_type, * from t1
union all
select CASE WHEN id = 1 THEN 'b' WHEN id = 3 THEN 'c' end as event_type, * from
t2
explain select * from v1 where event_type = 'a';
{code}
Before this PR:
{noformat}
== Physical Plan ==
Union
:- *(1) Project [a AS event_type#30533, id#30535L]
: +- *(1) ColumnarToRow
: +- FileScan parquet default.t1[id#30535L] Batched: true, DataFilters: [],
Format: Parquet
+- *(2) Project [CASE WHEN (id#30536L = 1) THEN b WHEN (id#30536L = 3) THEN c
END AS event_type#30534, id#30536L]
+- *(2) Filter (CASE WHEN (id#30536L = 1) THEN b WHEN (id#30536L = 3) THEN c
END = a)
+- *(2) ColumnarToRow
+- FileScan parquet default.t2[id#30536L] Batched: true, DataFilters:
[(CASE WHEN (id#30536L = 1) THEN b WHEN (id#30536L = 3) THEN c END = a)],
Format: Parquet
{noformat}
After this PR:
{noformat}
== Physical Plan ==
*(1) Project [a AS event_type#8, id#4L]
+- *(1) ColumnarToRow
+- FileScan parquet default.t1[id#4L] Batched: true, DataFilters: [],
Format: Parquet
{noformat}
> Simplify/Optimize conditional expressions
> ------------------------------------------
>
> Key: SPARK-33910
> URL: https://issues.apache.org/jira/browse/SPARK-33910
> Project: Spark
> Issue Type: Umbrella
> Components: SQL
> Affects Versions: 3.2.0
> Reporter: Yuming Wang
> Priority: Major
>
> Simplify/Optimize conditional expressions. We can improve these cases:
> 1. Reduce read datasource.
> 2. Simple CaseWhen/If to support filter push down.
> {code:sql}
> create table t1 using parquet as select * from range(100);
> create table t2 using parquet as select * from range(200);
> create temp view v1 as
>
> select 'a' as event_type, * from t1
>
> union all
>
> select CASE WHEN id = 1 THEN 'b' WHEN id = 3 THEN 'c' end as event_type, *
> from t2
> explain select * from v1 where event_type = 'a';
> {code}
> Before this PR:
> {noformat}
> == Physical Plan ==
> Union
> :- *(1) Project [a AS event_type#30533, id#30535L]
> : +- *(1) ColumnarToRow
> : +- FileScan parquet default.t1[id#30535L] Batched: true, DataFilters:
> [], Format: Parquet
> +- *(2) Project [CASE WHEN (id#30536L = 1) THEN b WHEN (id#30536L = 3) THEN c
> END AS event_type#30534, id#30536L]
> +- *(2) Filter (CASE WHEN (id#30536L = 1) THEN b WHEN (id#30536L = 3) THEN
> c END = a)
> +- *(2) ColumnarToRow
> +- FileScan parquet default.t2[id#30536L] Batched: true,
> DataFilters: [(CASE WHEN (id#30536L = 1) THEN b WHEN (id#30536L = 3) THEN c
> END = a)], Format: Parquet
> {noformat}
> After this PR:
> {noformat}
> == Physical Plan ==
> *(1) Project [a AS event_type#8, id#4L]
> +- *(1) ColumnarToRow
> +- FileScan parquet default.t1[id#4L] Batched: true, DataFilters: [],
> Format: Parquet
> {noformat}
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