text: set enable_seqscan=off;
  
  CREATE TABLE test_float4 (
  	i float4
  );
  
  INSERT INTO test_float4 VALUES (-2),(-1),(0),(1),(2),(3);
  
  CREATE INDEX idx_float4 ON test_float4 USING rum (i);
  
  SELECT * FROM test_float4 WHERE i<1::float4 ORDER BY i;
  SELECT * FROM test_float4 WHERE i<=1::float4 ORDER BY i;
  SELECT * FROM test_float4 WHERE i=1::float4 ORDER BY i;
  SELECT * FROM test_float4 WHERE i>=1::float4 ORDER BY i;
  SELECT * FROM test_float4 WHERE i>1::float4 ORDER BY i;
  
  EXPLAIN (costs off)
  SELECT *, i <=> 0::float4 FROM test_float4 ORDER BY i <=> 0::float4;
  SELECT *, i <=> 0::float4 FROM test_float4 ORDER BY i <=> 0::float4;
  
  EXPLAIN (costs off)
  SELECT *, i <=> 1::float4 FROM test_float4 WHERE i<1::float4 ORDER BY i <=> 1::float4;
  SELECT *, i <=> 1::float4 FROM test_float4 WHERE i<1::float4 ORDER BY i <=> 1::float4;
  