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Transcript 
Not “IF” But “WHEN”?
• “Schema on Write”
– Traditional Approach
• “Schema on Read”
– Data is simply copied to the file store, no
transformation is needed.
– A SerDe (Serializer/Deserlizer) is applied during read
time to extract the required columns (late binding)
– New data can start flowing anytime and will appear
retroactively once the SerDe is updated to parse it.
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