From 3589a135ef7f8d80bb4e218dcfc4d11f7e773eda Mon Sep 17 00:00:00 2001
From: GoodBai <bgd_sh@hotmail.com>
Date: Tue, 27 Feb 2024 04:39:17 +0800
Subject: [PATCH] community: make `SET allow_experimental_[engine]_index`
 configurabe in vectorstores.clickhouse (#18107)

## Description & Issue
While following the official doc to use clickhouse as a vectorstore, I
found only the default `annoy` index is properly supported. But I want
to try another engine `usearch` for `annoy` is not properly supported on
ARM platforms.
Here is the settings I prefer:

``` python
settings = ClickhouseSettings(
    table="wiki_Ethereum",
    index_type="usearch",  # annoy by default
    index_param=[],
)
```
The above settings do not work for the command `set
allow_experimental_annoy_index=1` is hard-coded.
This PR will make sure the experimental feature follow the `index_type`
which is also consistent with Clickhouse's naming conventions.
---
 libs/community/langchain_community/vectorstores/clickhouse.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/libs/community/langchain_community/vectorstores/clickhouse.py b/libs/community/langchain_community/vectorstores/clickhouse.py
index 4b8628daf7a..816ccd2aaca 100644
--- a/libs/community/langchain_community/vectorstores/clickhouse.py
+++ b/libs/community/langchain_community/vectorstores/clickhouse.py
@@ -205,8 +205,8 @@ CREATE TABLE IF NOT EXISTS {self.config.database}.{self.config.table}(
         )
         # Enable JSON type
         self.client.command("SET allow_experimental_object_type=1")
-        # Enable Annoy index
-        self.client.command("SET allow_experimental_annoy_index=1")
+        # Enable index
+        self.client.command(f"SET allow_experimental_{self.config.index_type}_index=1")
         self.client.command(self.schema)
 
     @property