Store metadata in dedicated columns #1
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This PR adds a new option to the PostgresDocumentStore. You can initialize it with
useMetadataColumnsset to true. If enabled, the document store will check documents and properties for ametadatakey and if set, stores the metadata in dedicated columns and uses them in queries.A new
MetadataColumnIndexcan be used to tell Postgres about the columns. The document store adds or removes the columns inaddCollection,addCollectionIndex,dropCollectionIndex.See tests for details.