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Github user stanzhai commented on the issue:
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@gatorsmile @DonnyZone When comparing a string to a int in Hive, it will
cast string type to double.
```
hive> select * from tb;
0 0
0.1 0
true0
Github user stanzhai commented on the issue:
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@DonnyZone @gatorsmile @cloud-fan PostgreSQL will throw an error when
comparing a string to a int.
```
postgres=# select * from tb;
a | b
--+---
0.1 | 1
a
Github user DonnyZone commented on the issue:
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@gatorsmile For this issue, I think the behevior in PromoteStrings rule is
reasonable, but there are problems in underlying converter UTF8String.
As described in PR-15880
Github user maropu commented on the issue:
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Yea, since this topic is important for some users, I mean we better move
the doc into `./docs/` ( I feel novices dont seem to check the code documents).
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Github user gatorsmile commented on the issue:
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@maropu Previously I did it in
https://github.com/apache/spark/blob/master/sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/analysis/TypeCoercionSuite.scala#L34-L59
We can
Github user maropu commented on the issue:
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Either way, we couldn't touch on this behaviour until the next major
release? (It seems we've already fixed this policy for the 2.x releases in
#15880... maybe). Btw, I feel we first should document
Github user gatorsmile commented on the issue:
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In Hive, `1 = 'true'` will return `true`? `19157170390056973L =
'19157170390056971'` will return `true`?
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Github user wangyum commented on the issue:
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@gatorsmile Seems cast to `double` is correct.
```
hive> create table spark_21646(c1 string, c2 string);
hive> insert into spark_21646
Github user gatorsmile commented on the issue:
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@stanzhai @wangyum How about Hive? I think your usage scenarios are for
hive compatibility, right?
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Github user wangyum commented on the issue:
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There is a issue if a string value out of double range, see:
[SPARK-21646](https://issues.apache.org/jira/browse/SPARK-21646).
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Github user stanzhai commented on the issue:
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In MySQL conversion of values from one string type to numeric, will be
compared as floating-point (real) numbers.
[](https://dev.mysql.com/doc/refman/5.7/en/type-conversion.html)
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Github user gatorsmile commented on the issue:
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@stanzhai Implicit type casting has to follow some rules. If you think this
is a bug, could you do a complete investigation about this issue? For example,
how Hive handles the type promotion?
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ok to test
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