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https://issues.apache.org/jira/browse/PHOENIX-3430?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Swaroopa Kadam reassigned PHOENIX-3430:
---------------------------------------
Assignee: Swaroopa Kadam
> Optimizer not using all columns from secondary index
> ----------------------------------------------------
>
> Key: PHOENIX-3430
> URL: https://issues.apache.org/jira/browse/PHOENIX-3430
> Project: Phoenix
> Issue Type: Bug
> Affects Versions: 4.8.0
> Reporter: Zhenhua Xu
> Assignee: Swaroopa Kadam
> Priority: Major
>
> ================ Setup =================
> DROP TABLE IF EXISTS TEST.TEMP;
> CREATE TABLE TEST.TEMP (
> ORGANIZATION_ID CHAR(15) NOT NULL,
> NETWORK_ID CHAR(15) NOT NULL,
> ENTITY_ID CHAR(15) NOT NULL,
> SCORE DOUBLE
> CONSTRAINT TOP_ENTITY_PK PRIMARY KEY (
> ORGANIZATION_ID,
> NETWORK_ID,
> ENTITY_ID
> )
> ) VERSIONS=1;
> CREATE INDEX IF NOT EXISTS TEMP_INDEX ON TEST.TEMP (ORGANIZATION_ID,
> NETWORK_ID, SCORE DESC, ENTITY_ID DESC);
> EXPLAIN
> SELECT entity_id, MAX(score) FROM TEST.TEMP
> WHERE organization_id = 'organization_id'
> AND (network_id = 'network_id' OR network_id='network_id1')
> AND ((score = 9.0 AND entity_id < 'entity_id') OR score < 9.0)
> GROUP BY entity_id
> ORDER BY MAX(score) DESC, entity_id DESC
> LIMIT 100;
> =============== Execution Plan ===============
> -CLIENT 1-CHUNK PARALLEL 1-WAY SKIP SCAN ON 2 KEYS OVER TEST.TEMP_INDEX
> ['organization_id','network_id '] - ['organization_id','network_id1 ']
> --SERVER FILTER BY FIRST KEY ONLY AND ((TO_DOUBLE("SCORE") = 9.0 AND
> "ENTITY_ID" < 'entity_id') OR TO_DOUBLE("SCORE") < 9.0)
> --SERVER AGGREGATE INTO DISTINCT ROWS BY ["ENTITY_ID"]
> -CLIENT MERGE SORT
> -CLIENT TOP 100 ROWS SORTED BY [MAX(TO_DOUBLE("SCORE")) DESC, "ENTITY_ID"
> DESC]
> The execution plan shows a server-side skip scans using only the first 2
> columns in the TEMP_INDEX secondary index. It could have used the SCORE and
> ENTITY_ID columns to speed up server side scans also.
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