[PATCH v2] Introduce spgist quadtree @<(point,circle) operator

Hi,

This patch series is to add support for spgist quadtree @<(point,circle)
operator. The first two patches are to refactor existing code before
implemention the new feature. The third commit is the actual implementation
provided with a set of simple unit tests.

Changes since v2:
- fix coding style
- add comment to spg_quad_inner_consistent_circle_helper()
- rework spg_quad_inner_consistent_circle_helper() using HYPOT() to make the
search consistent with filter scan

Matwey V. Kornilov (3):
Introduce helper variable in spgquadtreeproc.c
Introduce spg_quad_inner_consistent_box_helper() in spgquadtreeproc.c
Add initial support for spgist quadtree @<(point,circle) operator

src/backend/access/spgist/spgquadtreeproc.c | 147 +++++++++++++++-------
src/include/catalog/pg_amop.dat | 3 +
src/test/regress/expected/create_index_spgist.out | 96 ++++++++++++++
src/test/regress/sql/create_index_spgist.sql | 32 +++++
4 files changed, 234 insertions(+), 44 deletions(-)

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2.13.7

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With best regards,
Matwey V. Kornilov