Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/19389
I have just made a table to check the diff easily:
**Before**:
|InputA \
InputB|`NullType`|`IntegerType`|`LongType`|`DecimalType(38,0)`|`DoubleType`|`DateType`|`TimestampType`|`StringType`|
|------------------------|----------|----------|----------|----------|----------|----------|----------|----------|
|**`NullType`**|`StringType`|||`StringType`||`StringType`|`StringType`||
|**`IntegerType`**||||`IntegerType`||`IntegerType`|`IntegerType`||
|**`LongType`**||||`LongType`|`DoubleType`|`LongType`|`LongType`||
|**`DecimalType(38,0)`**|`StringType`|`IntegerType`|`LongType`||`DoubleType`|`DecimalType(38,0)`|`DecimalType(38,0)`||
|**`DoubleType`**|||`DoubleType`|`DoubleType`||`DoubleType`|`DoubleType`||
|**`DateType`**|`StringType`|`IntegerType`|`LongType`|`DateType`|`DoubleType`||`DateType`||
|**`TimestampType`**|`StringType`|`IntegerType`|`LongType`|`TimestampType`|`DoubleType`||||
|**`StringType`**|||||||||
**After**:
|InputA \
InputB|`NullType`|`IntegerType`|`LongType`|`DecimalType(38,0)`|`DoubleType`|`DateType`|`TimestampType`|`StringType`|
|------------------------|----------|----------|----------|----------|----------|----------|----------|----------|
|**`NullType`**|`NullType`|||`DecimalType(38,0)`||`DateType`|`TimestampType`||
|**`IntegerType`**||||`DecimalType(38,0)`||`StringType`|`StringType`||
|**`LongType`**||||`DecimalType(38,0)`|`StringType`|`StringType`|`StringType`||
|**`DecimalType(38,0)`**|`DecimalType(38,0)`|`DecimalType(38,0)`|`DecimalType(38,0)`||`StringType`|`StringType`|`StringType`||
|**`DoubleType`**|||`StringType`|`StringType`||`StringType`|`StringType`||
|**`DateType`**|`DateType`|`StringType`|`StringType`|`StringType`|`StringType`||`TimestampType`||
|**`TimestampType`**|`TimestampType`|`StringType`|`StringType`|`StringType`|`StringType`||||
|**`StringType`**|||||||||
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