Jackie-Jiang commented on pull request #6845:
URL: https://github.com/apache/incubator-pinot/pull/6845#issuecomment-828082724
For the complex type column, I can see 4 different operations:
- SKIP (not include in the output)
- FLATTEN (into key-value pairs, can generate multiple records for list)
- RETAIN (as Map or List)
- TO_JSON_STRING
We can have a default operation, then have an override field list for each
operation.
We should probably separate the map config from the list config because I
can see a common case where user only want to flatten map but not the list, so
that list can be stored as MV column.
Also, I think we should make delimiter configurable. I remember there are
some issues storing column name with dot in presto connector (@xiangfu0 to
confirm).
So the overall config would look like:
```
complexTypeConfig: {
"map": {
"default": "FLATTEN",
"SKIP": ["colA"],
"TO_JSON_STRING": ["colB"],
"delimiter": "_"
},
"list": {
"default": "RETAIN",
"FLATTEN": ["colC_listField"],
}
}
```
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