Keeping Small Queries Fast – Short query optimizations in Apache Impala
Cloudera
NOVEMBER 13, 2020
Impala’s planner does not do exhaustive cost-based optimization. Instead, it makes cost-based decisions with more limited scope (for example when comparing join strategies) and applies rule-based and heuristic optimizations for common query patterns. Pipelining is critical for taking advantage of modern CPU and memory architectures.
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