Apache Drill vs Apache Impala

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Apache Drill
Schema-free SQL Query Engine for Hadoop, NoSQL and Cloud Storage. Get faster insights without the overhead (data loading, schema creation and maintenance, transformations, etc.). Analyze the multi-structured and nested data in non-relational datastores directly without transforming or restricting the data
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Apache Impala
Apache Impala is a modern, open source, distributed SQL query engine for Apache Hadoop.