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Document exponent differences when casting floating point to string [skip ci] #4270

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Dec 2, 2021
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Document exponent differences when casting floating point to string [skip ci] #4270

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3 changes: 2 additions & 1 deletion docs/compatibility.md
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Expand Up @@ -725,7 +725,8 @@ This configuration setting is ignored when using Spark versions prior to 3.1.0.
### Float to String

The GPU will use different precision than Java's toString method when converting floating-point data
types to strings and this can produce results that differ from the default behavior in Spark.
types to strings. The GPU uses a lowercase `e` prefix for an exponent while Spark uses uppercase
`E`. As a result the computed string can differ from the default behavior in Spark.

To enable this operation on the GPU, set
[`spark.rapids.sql.castFloatToString.enabled`](configs.md#sql.castFloatToString.enabled) to `true`.
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