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#ifndef IMPALA_EXPRS_IS_NOT_EMPTY_PREDICATE_H_
#define IMPALA_EXPRS_IS_NOT_EMPTY_PREDICATE_H_

#include "exprs/predicate.h"

namespace impala {

class ScalarExprEvaluator;
class TExprNode;

/// Predicate that checks whether a collection is empty or not.
/// TODO: Implement this predicate via the UDF interface once the
/// interface supports CollectionVals.
class IsNotEmptyPredicate : public Predicate {
 public:
  static const char* LLVM_CLASS_NAME;
  virtual Status GetCodegendComputeFnImpl(
      LlvmCodeGen* codegen, llvm::Function** fn) override;
  virtual BooleanVal GetBooleanValInterpreted(
      ScalarExprEvaluator*, const TupleRow*) const override;
  virtual std::string DebugString() const override;

 protected:
  friend class ScalarExpr;

  virtual Status Init(
      const RowDescriptor& row_desc, bool is_entry_point, RuntimeState* state) override;
  explicit IsNotEmptyPredicate(const TExprNode& node);
};

} // namespace impala

#endif