Examples of org.apache.hadoop.hive.ql.optimizer.physical.NullScanOptimizer$Limit0Processor

Package org.apache.hadoop.hive.ql.optimizer.physical

Examples of org.apache.hadoop.hive.ql.optimizer.physical.NullScanOptimizer$Limit0Processor

org.apache.hadoop.hive.ql.optimizer.physical.NullScanOptimizer
This optimizer attempts following two optimizations: 1. If it finds TS followed By FIL which has been determined at compile time to evaluate to zero, it removes all input paths for that table scan. 2. If it finds TS followed by Limit 0, it removes all input paths from table scan.

      Context ctx) throws SemanticException {
    PhysicalContext physicalCtx = new PhysicalContext(conf, pCtx, pCtx.getContext(), rootTasks,
       pCtx.getFetchTask());


    if (conf.getBoolVar(HiveConf.ConfVars.HIVENULLSCANOPTIMIZE)) {
      physicalCtx = new NullScanOptimizer().resolve(physicalCtx);
    } else {
      LOG.debug("Skipping null scan query optimization");
    }


    if (conf.getBoolVar(HiveConf.ConfVars.HIVEMETADATAONLYQUERIES)) {

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