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org.apache.spark.sql.internal.connector

SupportsStreamingUpdateAsAppend

trait SupportsStreamingUpdateAsAppend extends WriteBuilder

An internal WriteBuilder mixin to support UPDATE streaming output mode. Now there's no good way to pass the keys to upsert or replace (delete -> append), we do the same with append writes and let end users to deal with.

This approach may be still valid for streaming writers which can't do the upsert or replace. We can promote the API to the official API along with the new API for upsert/replace.

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  5. def buildForBatch(): BatchWrite

    Returns a BatchWrite to write data to batch source.

    Returns a BatchWrite to write data to batch source. By default this method throws exception, data sources must overwrite this method to provide an implementation, if the Table that creates this write returns TableCapability#BATCH_WRITE support in its Table#capabilities().

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  6. def buildForStreaming(): StreamingWrite

    Returns a StreamingWrite to write data to streaming source.

    Returns a StreamingWrite to write data to streaming source. By default this method throws exception, data sources must overwrite this method to provide an implementation, if the Table that creates this write returns TableCapability#STREAMING_WRITE support in its Table#capabilities().

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