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Document which functional vindex types are capable of mapping NULL values #7551

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aquarapid opened this issue Feb 25, 2021 · 1 comment
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Document which functional vindex types are capable of mapping NULL values #7551

aquarapid opened this issue Feb 25, 2021 · 1 comment
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@aquarapid
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Component: Query Serving Type: Enhancement Logical improvement (somewhere between a bug and feature)

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@aquarapid
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Not all vindex types are capable of mapping NULL SQL values.

For example, the hash vindex type outputs DestinationNone for a NULL SQL value. As a result, any vschema that uses a primary vindex of type hash, effectively cannot have NULL input values for that primary vindex column for any rows.

Other vindex types, such as xxhash or unicode_loose_md5 is happy to map NULL values.

We should document this.
@aquarapid aquarapid added the Type: Enhancement Logical improvement (somewhere between a bug and feature) label Feb 25, 2021
@aquarapid aquarapid self-assigned this Feb 25, 2021
@aquarapid aquarapid mentioned this issue Feb 25, 2021
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PR opened to document this here: vitessio/website#714

@aquarapid aquarapid mentioned this issue Feb 27, 2021
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Component: Query Serving Type: Enhancement Logical improvement (somewhere between a bug and feature)
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