Jason Fehr created IMPALA-15270:
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Summary: Implement Geospatial ST_Buffer Function Using Boost
Key: IMPALA-15270
URL: https://issues.apache.org/jira/browse/IMPALA-15270
Project: IMPALA
Issue Type: Improvement
Affects Versions: Impala 5.0.0
Reporter: Jason Fehr
Assignee: Jason Fehr
Move the implementation of the ST_Buffer geospatial function from Java to
Boost's buffer() geospatial function. Also add a third and fourth parameter to
the function:
*Parameter 3:* use_spheroid -- boolean indicating if the return should use the
spheroidal buffer polygon for more accurate representation over the Earth
*Parameter 4:* buffer_style -- string containing space-separated key-value
pairs that control the returned buffer polygon. The following keys are allowed:
- quad_segs=# : Number of line segments utilized to approximate a quarter
circle (default is 8).
- endcap=round|flat: End cap style (default is round). butt is an accepted
synonym for flat.
- join=round|mitre: Join style (default is round). miter is an accepted
synonym for mitre.
- mitre_limit=#.# : mitre ratio limit and it only affects mitred join
style. miter_limit is an accepted synonym for mitre_limit.
- side=both|left|right : Defaults to both. Setting left or right enables a
single-sided buffer operation on the geometry, with the buffered side aligned
according to the direction of the line. This functionality is specific to
LINESTRING geometry and has no impact on POINT or POLYGON geometries.
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