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doris/fe
zhengshiJ e6da00bb26 [feature](nereides) support sort translator (#10678)
Physical sort:
     * 1. Build sortInfo
     *    There are two types of slotRef:
     *    one is generated by the previous node, collectively called old.
     *    the other is newly generated by the sort node, collectively called new.
     *    Filling of sortInfo related data structures,
     *    a. ordering use newSlotRef.
     *    b. sortTupleSlotExprs use oldSlotRef.
     * 2. Create sortNode
     * 3. Create mergeFragment

TODO:
1.Currently, columns that do not exist in select but exist in order by cannot be parsed.
eg: select key from table order by value;

2.For the combination of Literal and slotRefrance in select, there is a problem with parsing, 
eg: select key ,(10-value) from table;
2022-07-08 19:22:48 +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