Add support for GROUP BY with cs_grouped_value_v1
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This change adds support for decrypting encrypted columns included in the
`GROUP BY` clause by using a new aggregate function, `cs_grouped_value_v1`.
How it works:
- An ORE term (either in an ORE or SteVec index) can be used in `GROUP BY`
- `cs_grouped_value_v1` can be used in the `SELECT` target list to return a
single source ciphertext for each group
- the ORE index is used for the equality check needed for grouping
- `cs_grouped_value_v1` allows for using the source ciphertext in the `SELECT`
target list (since `SELECT`ed items must either use an aggregrate function or
appear in the `GROUP BY`)
- note that including the source ciphertext in the `GROUP BY` statement wouldn't
work because source ciphertexts are non-deterministic and don't support
comparison operations (that's what ORE indexes are for)
freshtonic
approved these changes
Oct 31, 2024
fimac
approved these changes
Oct 31, 2024
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This change adds support for decrypting encrypted columns included in the
GROUP BYclause by using a new aggregate function,cs_grouped_value_v1.How it works:
GROUP BYcs_grouped_value_v1can be used in theSELECTtarget list to return a single source ciphertext for each groupcs_grouped_value_v1allows for using the source ciphertext in theSELECTtarget list (sinceSELECTed items must either use an aggregrate function or appear in theGROUP BY)GROUP BYstatement wouldn't work because source ciphertexts are non-deterministic and don't support comparison operations (that's what ORE indexes are for)