fork of https://github.com/oxigraph/rocksdb and https://github.com/facebook/rocksdb for nextgraph and oxigraph

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Levi Tamasi 06ab0a8b40 Add wide-column support to iterators (#10670) ... Summary: The patch extends the iterator API with a new `columns` method which can be used to retrieve all wide columns for the current key. Similarly to the `Get` and `GetEntity` APIs, the classic `value` API returns the value of the default (anonymous) column for wide-column entities, and `columns` returns an entity with a single default column for plain old key-values. (The goal here is to maintain the invariant that `value()` is the same as the value of the default column in `columns()`.) The patch also involves a smaller refactoring: historically, `value()` was implemented using a bunch of conditions, that is, the `Slice` to be returned was decided based on the direction of the iteration, whether a merge had been done etc. when the method was called; with the patch, the value to be exposed is stored in a member `Slice value_` when the iterator lands on a new key, and `value()` simply returns this `Slice`. Pull Request resolved: https://github.com/facebook/rocksdb/pull/10670 Test Plan: Ran `make check` and a simple blackbox crash test. Reviewed By: riversand963 Differential Revision: D39475551 Pulled By: ltamasi fbshipit-source-id: 29e7a6ed9ef340841aab36803b832b7c8f668b0b		2 years ago
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db_wide_basic_test.cc	Add wide-column support to iterators (#10670)	2 years ago
wide_column_serialization.cc	Add wide-column support to iterators (#10670)	2 years ago
wide_column_serialization.h	Make queries return the value of the default column for wide-column entities (#10483)	2 years ago
wide_column_serialization_test.cc	Add API for writing wide-column entities (#10242)	2 years ago
wide_columns.cc	Add support for wide-column point lookups (#10540)	2 years ago