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doris/fe
Shuo Wang d6c3470c8d [feature](Nereids) support materialized index selection (#13416)
This PR unified the selection of rollup index and materialized view index into uniform logic, which is called selecting materialized index. 

Main steps:

### Find candidate indexes
1. When aggregate is present, it's handled in `SelectMaterializedIndexWithAggregate`.  The base index and indexes that could use pre-aggregation should be used. The pre-aggregation status is determined by aggregation function, grouping expression, and pushdown predicates.
2. When aggregate is not on top of scan node, it's handled in `SelectMaterializedIndexWithoutAggregate`. The base index and indexes that have all the key columns could be used.

### Filter and order the candidate indexes
1. filter indexes that contain all the required output scan columns.
2. filter indexes that could match prefix index most.
3. order the result index by row count, column count, and index id.
2022-10-25 19:25:58 +08:00
..

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# fe-common

This module is used to store some common classes of other modules.

# spark-dpp

This module is Spark DPP program, used for Spark Load function.
Depends: fe-common

# fe-core

This module is the main process module of FE.
Depends: fe-common, spark-dpp