[SPARK-15983][SQL] Removes FileFormat.prepareRead #13698
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What changes were proposed in this pull request?
Interface method
FileFormat.prepareRead()
was added in #12088 to handle a special case in the LibSVM data source.However, the semantics of this interface method isn't intuitive: it returns a modified version of the data source options map. Considering that the LibSVM case can be easily handled using schema metadata inside
inferSchema
, we can remove this interface method to keep theFileFormat
interface clean.How was this patch tested?
Existing tests.