chore: add limitations docs (#109)

* chore: add limitations docs * incorporate requested changes * fix docs * chore: Update docs/limitations.rst Co-authored-by: Knut Olav Løite <[email protected]> Co-authored-by: ansh0l <[email protected]> Co-authored-by: Knut Olav Løite <[email protected]>
googleapis · Aug 17, 2022 · 5c72bae · 5c72bae
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+Limitations
+------------------------------------
+
+Session Labeling
+~~~~~~~~~~~~~~~~
+Cloud Spanner Session Labeling is not supported.
+
+Request Priority
+~~~~~~~~~~~~~~~~
+Request priority can be set by unwrapping the Spanner-specific `SpannerConn` interface and setting the request priority as part of a db call.
+
+Tagging
+~~~~~~~
+Tags can be set by unwrapping the Spanner-specific `SpannerConn` interface and setting the tags using that interface.
+
+Partition Reads
+~~~~~~~
+Partition Reads can be done by unwrapping the Spanner-specific `SpannerConn` interface and doing the parition reads using that interface.
+
+PostgreSQL
+~~~~~~~
+Spanner databases that use the PostgreSQL dialect are not yet supported.
+
+Backups
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+Backups are not supported by this driver. Use the [Cloud Spanner Go client library](https://github.com/googleapis/google-cloud-go/tree/main/spanner) to manage backups programmatically.