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new 647e248682 Update java-user-defined-function.md
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commit 647e2486824d442a5139d7b6febff70b5ceead7e
Author: Luzhijing <82810928+luzhij...@users.noreply.github.com>
AuthorDate: Tue Apr 23 10:34:39 2024 +0800
Update java-user-defined-function.md
---
.../ecosystem/udf/java-user-defined-function.md | 25 +++++-----------------
1 file changed, 5 insertions(+), 20 deletions(-)
diff --git
a/versioned_docs/version-2.1/ecosystem/udf/java-user-defined-function.md
b/versioned_docs/version-2.1/ecosystem/udf/java-user-defined-function.md
index a3bf666258..7c739651eb 100644
--- a/versioned_docs/version-2.1/ecosystem/udf/java-user-defined-function.md
+++ b/versioned_docs/version-2.1/ecosystem/udf/java-user-defined-function.md
@@ -24,14 +24,6 @@ specific language governing permissions and limitations
under the License.
-->
-# Java UDF
-
-<version since="1.2.0">
-
-Java UDF
-
-</version>
-
Java UDF provides users with a Java interface written in UDF to facilitate the
execution of user-defined functions in Java language. Compared with native UDF
implementation, Java UDF has the following advantages and limitations:
1. The advantages
* Compatibility: Using Java UDF can be compatible with different Doris
versions, so when upgrading Doris version, Java UDF does not need additional
migration. At the same time, Java UDF also follows the same programming
specifications as hive / spark and other engines, so that users can directly
move Hive / Spark UDF jar to Doris.
@@ -113,10 +105,11 @@ CREATE FUNCTION java_udf_add_one(int) RETURNS int
PROPERTIES (
* The "always_nullable" is optional attribute, if there is special treatment
for the NULL value in the calculation, it is determined that the result will
not return NULL, and it can be set to false, so that the performance may be
better in the whole calculation process.
* If you use the local path method, the jar package that the database driver
depends on, the FE and BE nodes must be placed here
+
## Create UDAF
-<br/>
+
When using Java code to write UDAF, there are some functions that must be
implemented (mark required) and an inner class State, which will be explained
with a specific example below.
-The following SimpleDemo will implement a simple function similar to sum, the
input parameter is INT, and the output parameter is INT
+The following SimpleDemo will implement a simple function similar to sum, the
input parameter is INT, and the output parameter is INT.
```JAVA
package org.apache.doris.udf.demo;
@@ -332,10 +325,8 @@ CREATE AGGREGATE FUNCTION middle_quantiles(DOUBLE,INT)
RETURNS DOUBLE PROPERTIES
);
```
-<version since="2.1">
-
## Create UDTF
-<br/>
+
UDTF functions, like UDF functions, require users to implement an `evaluate`
method. However, the return value of a UDTF function must be of Array type.
Additionally, in Doris, table functions behave differently depending on the
_outer suffix. You can refer to the
[OUTER-Combinator](../sql-manual/sql-functions/table-functions/explode-numbers-outer)
@@ -360,14 +351,8 @@ CREATE TABLES FUNCTION java-utdf(string, string) RETURNS
array<string> PROPERTIE
);
```
-<br/>
-
* The implemented jar package can be stored at local or in a remote server and
downloaded via http, And each BE node must be able to obtain the jar package;
-Otherwise, the error status message "Couldn't open file..." will be returned
-
-
-
-<br/>
+Otherwise, the error status message "Couldn't open file..." will be returned.
## Use UDF
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