smallzhongfeng opened a new pull request, #39558:
URL: https://github.com/apache/spark/pull/39558
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### What changes were proposed in this pull request?
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Ensure that partitions of type string without quotation marks are not
recognized as numeric types and then partition.
For example:
```
create table if not exists test_90(a string, b string) partitioned by (dt
string);
desc formatted test_90;
insert into table test_90 partition (dt=05) values("1","2");
insert into table test_90 partition (dt='05') values("1","2");
drop table test_90;
```
before spark3.1 and earlier, it will generate such a path:
`hdfs://test5/user/hive/db1/test_90/dt=05`
```
spark-sql> select * from test_90;
1 2 05
1 2 05
Time taken: 1.316 seconds, Fetched 2 row(s)
spark-sql> show partitions test_90;
dt=05
Time taken: 0.201 seconds, Fetched 1 row(s)
spark-sql> select * from test_90 where dt='05';
1 2 05
1 2 05
Time taken: 0.212 seconds, Fetched 2 row(s)
```
after spark3.1, it will generate two path:
`hdfs://test5/user/hive/db1/test_90/dt=05` and
`hdfs://test5/user/hive/db1/test_90/dt=5`
```
spark-sql> select * from test_90;
1 2 05
1 2 5
Time taken: 2.119 seconds, Fetched 2 row(s)
spark-sql> show partitions test_90;
dt=05
dt=5
Time taken: 0.161 seconds, Fetched 2 row(s)
spark-sql> select * from test_90 where dt='05';
1 2 05
Time taken: 0.252 seconds, Fetched 1 row(s)
```
This will cause inconsistent read data. After seeing
[https://github.com/apache/spark/pull/30421](https://github.com/apache/spark/pull/30421),
I think if the user does not know about this change and the migration document
does not mention it, I think it will affect the data quality, so I added the
parameter `spark.sql.legacy.keepPartitionSpecAsStringLiteral`, which will
maintain the original effect when the parameter set `true`.
### Why are the changes needed?
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If the partition is of `String`, but the value of partition without
quotation marks, it will still be treated as `String` through parameter
configuration.
### Does this PR introduce _any_ user-facing change?
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After the parameter `spark.sql.legacy.keepPartitionSpecAsStringLiteral` is
enabled, the partition path generated by partition `partition (dt=05)` and
partition `partition (dt='05')` is the same.
### How was this patch tested?
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New uts.
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