Update function description

docs/querying/sql-functions.md

@@ -510,7 +510,7 @@ Rounds down a timestamp by a given time unit.
 
 **Function type:** [Scalar, other](sql-scalar.md#other-scalar-functions)
 
-Decodes a Base64-encoded string into a [complex type](sql-scalar.md#complex-type-names), where `dataType` represents the complex type and `expr` is the Base64-encoded string to decode.
+Decodes a Base64-encoded string into a complex data type, where `dataType` is the complex data type and `expr` is the Base64-encoded string to decode.
 
 ## DECODE_BASE64_UTF8
 

docs/querying/sql-scalar.md

@@ -274,41 +274,6 @@ The [DataSketches extension](../development/extensions-core/datasketches-extensi
 |`CASE WHEN boolean_expr1 THEN result1 \[ WHEN boolean_expr2 THEN result2 ... \] \[ ELSE resultN \] END`|Searched CASE.|
 |`CAST(value AS TYPE)`|Cast value to another type. See [Data types](sql-data-types.md) for details about how Druid SQL handles CAST.|
 |`COALESCE(value1, value2, ...)`|Returns the first value that is neither NULL nor empty string.|
-|`DECODE_BASE64_COMPLEX(dataType, expr)`| Decodes a Base64-encoded string into a [complex type](sql-scalar.md#complex-type-names), where `dataType` represents the complex type and `expr` is the Base64-encoded string to decode.|
+|`DECODE_BASE64_COMPLEX(dataType, expr)`| Decodes a Base64-encoded string into a complex data type, where `dataType` is the complex data type and `expr` is the Base64-encoded string to decode. The `hyperUnique` and `serializablePairLongString` data types are supported by default. You can enable support for the following complex data types by loading their extensions:<br/><ul><li>`druid-bloom-filter`: `bloom`</li><li>`druid-datasketches`: `arrayOfDoublesSketch`, `HLLSketch`, `KllDoublesSketch`, `KllFloatsSketch`, `quantilesDoublesSketch`, `thetaSketch`</li><li>`druid-histogram`: `approximateHistogram`, `fixedBucketsHistogram`</li><li>`druid-stats`: `variance`</li><li>`druid-compressed-big-decimal`: `compressedBigDecimal`</li><li>`druid-momentsketch`: `momentSketch`</li><li>`druid-tdigestsketch`: `tDigestSketch`</li></ul>|
 |`NULLIF(value1, value2)`|Returns NULL if `value1` and `value2` match, else returns `value1`.|
-|`NVL(value1, value2)`|Returns `value1` if `value1` is not null, otherwise `value2`.|
-
-### Complex type names
-
-The `DECODE_BASE64_COMPLEX` function accepts the following complex type names as arguments for the `dataType` parameter:
-
-Built-in:
-  * `hyperUnique`
-  * `serializablePairLongString`
-
-Bloom filter:
-  * `bloom`
-
-DataSketches:
-  * `arrayOfDoublesSketch`
-  * `HLLSketch`
-  * `KllDoublesSketch`
-  * `KllFloatsSketch`
-  * `quantilesDoublesSketch`
-  * `thetaSketch`
-
-Histogram:
-  * `approximateHistogram`
-  * `fixedBucketsHistogram`
-
-Stats:
-  * `variance`
-
-Compressed big decimal:
-  * `compressedBigDecimal`
-
-Moment sketch:
-  * `momentSketch`
-
-T-digest sketch:
-  * `tDigestSketch`
+|`NVL(value1, value2)`|Returns `value1` if `value1` is not null, otherwise `value2`.|