If you look at the differing results carefully, there's this one: *** 3249,3255 **** ! [(0,0),(3,0),(4,5),(1,6)] | (-5,-12) | [(0,-0),(-15,-36),(40,-73),(67,-42)] --- 3249,3255 ---- ! [(0,0),(3,0),(4,5),(1,6)] | (-5,-12) | [(0,0),(-15,-36),(40,-73),(67,-42)]
(Third column is first multiplied by second). I wonder why the expected file has a -0 only in the second position and not both first and second. These are both positive zeroes being multiplied by a negative number. Why is 0 * -12 = -0 yet 0 * -5 = 0? What is going on? Is the sign suppressed for negative zeros only in the first coordinate? I suppose this is just a side effect of how float8_mi, _pl, _mul work (in point_mul_point). Anyway maybe your test case should use more of the float8 op combinations in order to show the difference. -- Álvaro Herrera https://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
