XIAOYU YU created GRIFFIN-322:
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Summary: Add SQL mode for ES connector
Key: GRIFFIN-322
URL: https://issues.apache.org/jira/browse/GRIFFIN-322
Project: Griffin
Issue Type: Improvement
Reporter: XIAOYU YU
The ElasticSearch connector was added in Griffin. We want to enrich it by
adding sql mode.
ES SQL plugins are very popular, such as :
[https://github.com/NLPchina/elasticsearch-sql/wiki
|https://github.com/NLPchina/elasticsearch-sql/wiki]and
[https://www.elastic.co/guide/en/elasticsearch/reference/7.x/xpack-sql.html].
For example:
{{}}
{code:java}
curl -X POST 'http://{es_url}/_sql?format=csv' -H 'Content-Type:
application/json' -d 'select a, b, c from {index} where a is not null limit
2'{code}
{{}}
would get csv response as follows:
{code:java}
a,b,c
1,test,1.55
2,test,1.57{code}
So we want Griffin ES Connector to load data by ES SQL like:
{{}}
{code:java}
{code}
{{"connectors": [ { }}
{{"type": "ElasticSearch", }}
{{"config": \{ "host": "xxxx", "port": xxxx, "sql": "select a, b, c from xxx
where a is not null" } }}
{{} ]}}
which has the following benefits:
# For case that only part of the ES data is needed, or only aggregated result
is needed, it could significantly reduce IO and improve performance by handle
filter and aggregation to ES.
# It is more user-friendly, since we don't need to define data size and
schema.
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