try_to_geography function

Applies to: Databricks SQL Databricks Runtime 17.1 and above

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nota

This feature is not available on Databricks SQL Classic warehouses. To learn more about Databricks SQL warehouses, see SQL warehouse types

Parses the input description of a geography and returns the corresponding GEOGRAPHY value, or NULL if the input description is invalid. The SRID value of the returned GEOGRAPHY value is 4326.

Syntax

try_to_geography ( geoRepExpr )

Arguments

• geoRepExpr: A BINARY or STRING expression representing a geography in WKB, WKT, or GeoJSON.

Returns

A value of type GEOGRAPHY(ANY), corresponding to the input geography description.

• The function returns NULL if the input is NULL.
• The function returns NULL if the input BINARY or STRING value is an inalid description of a geography.

Examples

SQL

-- Input geography is in WKT format.
> SELECT st_asgeojson(try_to_geography('POINT Z (3 4 5)'));
  {"type":"Point","coordinates":[3,4,5]}

-- Input geography is in GeoJSON format.
> SELECT st_asewkt(try_to_geography('{"type":"Point","coordinates":[3,4,5]}'));
  SRID=4326;POINT Z (3 4 5)

-- Input geography is in WKB format.
> SELECT st_astext(try_to_geography(X'01b90b0000000000000000084000000000000010400000000000001440000000000000f0bf'))
  POINT ZM (3 4 5 -1)

-- Input value is not the description of a geography.
> SELECT st_astext(try_to_geography('some string that does not represent a geography'))
  NULL

Related functions

• st_asbinary function
• st_asewkb function
• st_asewkt function
• st_asgeojson function
• st_astext function
• st_aswkb function
• st_aswkt function
• st_geogfromgeojson function
• st_geogfromtext function
• st_geogfromwkb function
• st_geogfromwkt function
• st_geomfromewkb function
• st_geomfromgeojson function
• st_geomfromtext function
• st_geomfromwkb function
• st_geomfromwkt function
• to_geography function
• to_geometry function
• try_to_geometry function