Features

• Immutable

• Binary

• Columnar

• Delta Lake vs. Parquet Comparison (opens in a new tab)

Shortcomings

• No ACID transactions for Parquet data lakes
• It is not easy to delete rows from Parquet tables
• No DML transactions
• There is no change data feed
• Slow file listing overhead
• Expensive footer reads to gather statistics for file skipping
• There is no way to rename, reorder, or drop columns without rewriting the whole table