writer-jill commented on code in PR #17658:
URL: https://github.com/apache/druid/pull/17658#discussion_r1930603845
##########
docs/querying/sql-functions.md:
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@@ -1756,39 +1809,66 @@ Returns the following:
## DECODE_BASE64_COMPLEX
-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.
+Decodes a base64-encoded expression into a complex data type.
-* **Syntax**: `DECODE_BASE64_COMPLEX(dataType, expr)`
-* **Function type:** Scalar, other
+You can use the function to ingest data when a column contains an encoded data
sketch such as Theta or HLL.
-[Learn more](sql-scalar.md#other-scalar-functions)
+The function supports `hyperUnique` and `serializablePairLongString` data
types by default.
+You can enable support for the following complex data types by [loading their
extensions](../configuration/extensions.md):
+
+- `druid-bloom-filter`: `bloom`
+- `druid-datasketches`: `arrayOfDoublesSketch`, `HLLSketch`,
`KllDoublesSketch`, `KllFloatsSketch`, `quantilesDoublesSketch`, `thetaSketch`
+- `druid-histogram`: `approximateHistogram`, `fixedBucketsHistogram`
+- `druid-stats`: `variance`
+- `druid-compressed-bigdecimal`: `compressedBigDecimal`
+- `druid-momentsketch`: `momentSketch`
+- `druid-tdigestsketch`: `tDigestSketch`
+
+* **Syntax:** `DECODE_BASE64_COMPLEX(dataType, expr)`
+* **Function type:** Scalar
+
+<details><summary>Example</summary>
+
+The following example decodes a Theta sketch from a base64-encoded sketch
contained in `theta_input`:
+
+```sql
+DECODE_BASE64_COMPLEX('thetaSketch', "theta_input")
+```
+The following example counts the distinct values in an encoded Theta sketch
column using
[`APPROX_COUNT_DISTINCT_DS_THETA`](#approx_count_distinct_ds_theta):
+
+```sql
+APPROX_COUNT_DISTINCT_DS_THETA(DECODE_BASE64_COMPLEX('thetaSketch',
"theta_input"))
+```
+
+</details>
+
+[Learn more](./sql-scalar.md#other-scalar-functions)
## DECODE_BASE64_UTF8
-Decodes a Base64-encoded string into a UTF-8 encoded string.
+Decodes a base64-encoded expression into a UTF-8 encoded string.
* **Syntax:** `DECODE_BASE64_UTF8(expr)`
-* **Function type:** Scalar, string
+* **Function type:** Scalar
Review Comment:
Fixed.
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