huaxingao commented on a change in pull request #28264:
URL: https://github.com/apache/spark/pull/28264#discussion_r412730079
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File path: docs/sql-ref-datatypes.md
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@@ -706,3 +708,53 @@ The following table shows the type names as well as
aliases used in Spark SQL pa
</table>
</div>
</div>
+
+### Floating Point Special Values
+
+Spark SQL supports several special floating point values in a case-insensitive
manner:
+
+ * Inf/+Inf/Infinity/+Infinity: positive infinity
+ * ```FloatType```: 1.0f / 0.0f, which is equal to the value returned by
<code>java.lang.Float.intBitsToFloat(0x7f800000)</code>.
+ * ```DoubleType```: 1.0 / 0.0, which is equal to the value returned by
<code>java.lang.Double.longBitsToDouble(0x7ff0000000000000L)</code>.
+ * -Inf/-Infinity: negative infinity
+ * ```FloatType```: -1.0f / 0.0f, which is equal to the value returned by
<code>java.lang.Float.intBitsToFloat(0xff800000)</code>.
+ * ```DoubleType```: -1.0 / 0.0, which is equal to the value returned by
<code>java.lang.Double.longBitsToDouble(0xfff0000000000000L)</code>.
+ * NaN: not a number
+ * ```FloatType```: 0.0f / 0.0f, which is equivalent to the value returned
by <code>java.lang.Float.intBitsToFloat(0x7fc00000)</code>.
+ * ```DoubleType```: 0.0d / 0.0, which is equivalent to the value returned
by <code>java.lang.Double.longBitsToDouble(0x7ff8000000000000L)</code>.
+
+#### Examples
+
+{% highlight sql %}
+SELECT double('infinity');
+ +------------------------+
Review comment:
I will remove the two leading spaces for this PR for now.
I almost finished everything on Xiao's SQL reference list. After I am done,
I will submit a PR to remove the two leading spaces in all the examples in SQL
reference docs.
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