adjacent2D Bigintspan_spgist_config contain2D Datespan_spgist_config distance_span_nodespan Floatspan_spgist_config getQuadrant2D Intspan_spgist_config left2D overlap2D overLeft2D overRight2D right2D Set_spgist_compress SortedSpan Span_kdtree_choose Span_kdtree_inner_consistent Span_kdtree_picksplit span_level_cmp span_lower_qsort_cmp Span_quadtree_choose Span_quadtree_inner_consistent Span_quadtree_picksplit span_spgist_get_span Span_spgist_inner_consistent Span_spgist_leaf_consistent span_upper_qsort_cmp spannode_copy spannode_init spannode_kdtree_next spannode_quadtree_next Spanset_spgist_compress Tstzspan_spgist_config

Span_quadtree_choose() Datum Span_quadtree_choose ( PG_FUNCTION_ARGS  ) Determine which quadrant a 2D-mapped span falls into, relative to the centroid. SP-GiST choose function for span types. Quadrants are numbered as follows: 3 | 0 ----+---- 2 | 1 where the lower bound of span is the horizontal axis and upper bound the vertical axis. Periods on one of the axes are taken to lie in the quadrant with higher value along perpendicular axis. That is, a value on the horizontal axis is taken to belong to quadrant 0 or 3, and a value on the vertical axis is taken to belong to quadrant 0 or 1. A span equal to centroid is taken to lie in quadrant 0.