gengliangwang opened a new pull request #25804: [SPARK-29096][SQL] The exact 
math method should be called only when there is a corresponding function in Math
URL: https://github.com/apache/spark/pull/25804
 
 
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   ### What changes were proposed in this pull request?
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   1. After https://github.com/apache/spark/pull/21599, if the option 
"spark.sql.failOnIntegralTypeOverflow" is enabled, all the Binary Arithmetic 
operator will used the exact version function.
   However, only `Add`/`Substract`/`Multiply` has a corresponding exact 
function in java.lang.Math . When the option 
"spark.sql.failOnIntegralTypeOverflow" is enabled, a runtime exception 
"BinaryArithmetics must override either exactMathMethod or genCode" is thrown 
if the other Binary Arithmetic operators are used, such as "Divide", 
"Remainder".
   The exact math method should be called only when there is a corresponding 
function in `java.lang.Math`
   2. Revise the log output of casting to `Int`/`Short`
   3. Enable `spark.sql.failOnIntegralTypeOverflow` for pgSQL tests in 
`SQLQueryTestSuite`.
   
   
   ### Why are the changes needed?
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   1. Fix the bugs of https://github.com/apache/spark/pull/21599
   2. The test case of pgSQL intends to check the overflow of integer/long 
type. We should enable `spark.sql.failOnIntegralTypeOverflow`.
   
   ### Does this PR introduce any user-facing change?
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   No
   
   ### How was this patch tested?
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   Unit test.

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