ajantha-bhat commented on a change in pull request #3481: [CARBONDATA-3548]Geospatial Support： add hash id create，query condition analyze and generate hash id list
URL:
https://github.com/apache/carbondata/pull/3481#discussion_r356544508
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File path: geo/src/main/java/org/apache/carbondata/geo/GeoHashImpl.java
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@@ -38,10 +41,66 @@
* columns.
*/
public class GeoHashImpl extends CustomIndex<List<Long[]>> {
+ private static final Logger LOGGER =
+ LogServiceFactory.getLogService(GeoHashImpl.class.getName());
+
+ // conversion factor of angle to radian
+ private static final double CONVERT_FACTOR = 180.0;
+ // Earth radius
+ private static final double EARTH_RADIUS = 6371004.0;
+ // Longitude of coordinate origin
+ // private double oriLongitude = 0;
+ // Latitude of coordinate origin
+ private double oriLatitude;
+ // User defined maximum longitude of map
+ private double userDefineMaxLongitude;
+ // User defined maximum latitude of map
+ private double userDefineMaxLatitude;
+ // User defined map minimum longitude
+ private double userDefineMinLongitude;
+ // User defined map minimum latitude
+ private double userDefineMinLatitude;
+ // The maximum longitude of the completed map after calculation
+ private double CalculateMaxLongitude;
+ // The maximum latitude of the completed map after calculation
+ private double CalculateMaxLatitude;
+ // Grid length is in meters
+ private int gridSize;
+ // cos value of latitude of origin of coordinate
+ private double mCos;
+ // The degree of Y axis corresponding to each grid size length
+ private double deltaY;
+ // Each grid size length should be the degree of X axis
+ private double deltaX;
+ // Degree * coefficient of Y axis corresponding to each grid size length
+ private double deltaYByRatio;
+ // Each grid size length should be X-axis Degree * coefficient
+ private double deltaXByRatio;
+ // The number of knives cut for the whole area (one horizontally and one vertically)
+ // is the depth of quad tree
+ private int cutLevel;
+ // used to convert the latitude and longitude of double type to int type for calculation
+ private int conversionRatio;
+ // * Constant of coefficient
+ private double lon0ByRation;
+ // * Constant of coefficient
+ private double lat0ByRation;
+
+
/**
* Initialize the geohash index handler instance.
- * @param handlerName
- * @param properties
+ * the properties is like that:
+ * TBLPROPERTIES ('INDEX_HANDLER'='mygeohash',
+ * 'INDEX_HANDLER.mygeohash.type'='geohash',
+ * 'INDEX_HANDLER.mygeohash.sourcecolumns'='longitude, latitude',
+ * 'INDEX_HANDLER.mygeohash.gridSize'='50'
+ * 'INDEX_HANDLER.mygeohash.minLongitude'='0'
+ * 'INDEX_HANDLER.mygeohash.maxLongitude'='0'
+ * 'INDEX_HANDLER.mygeohash.minLatitude'='100'
+ * 'INDEX_HANDLER.mygeohash.maxLatitude'='100'
+ * 'INDEX_HANDLER.mygeohash.orilatitude''8')
Review comment:
this GeoHashImpl.java cannot be the default implementation as it depends on grid size, min max latitude longitude and original latitude longitude.
will it work if these parameters set to 0 also ? then it can be default implementation. If it cannot work we can have it as a custom implementation and introduce simple default implementation that can work on any geo spatial polygon query. (with float longitude, latitude)
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