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This PR adds support for a presence vector inside a mutable and immutable segment. This will enable the query layer to ignore null values in the corresponding columns. Please see this issue for more details: #4230 High level gist is as follows: Create a presence vector per column per segment by default. This presence vector keeps track of which document ID has a null value in the corresponding column. Expose this through the DataSource interface to enable the caller to ignore such document IDs. Presence vector is not really used anywhere as part of this PR. Subsequent PRs will use them to enable filtering out columns in predicates (eg: select ... from table where column_name != null)
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