Implemetation of parse geography and geometry datatype (#4518)

[Gopalverma062]

Description

Implemented Parse function support for GeoSpatial TSQL data types that was previously unsupported in Babelfish. The Parse function has been added for both geometry and geography data types.

Changes include:

Function Implementation:

• Implemented geometry::Parse() and geography::Parse() functions by utilizing PostGIS parsing capabilities with necessary adjustments to ensure TSQL compatibility.

Parser Updates:

• Added Parse function definitions to the TSQL parser to recognize these new static methods.
• Ensured proper syntax handling for Parse function, including NVARCHAR parameter types and return values.

Test Cases:

• Created comprehensive test cases for Parse function, covering various scenarios including basic parsing, empty geometries, NULL handling, whitespace tolerance, case insensitivity, and error conditions.

Error Handling:

• Implemented appropriate error handling for invalid geometry strings and malformed inputs.

Extending existing functionalities:

• Added support for parsing empty instances in both geometry and geography datatypes
• Enhanced CAST operations compatibility with Parse results
• Added hierarchyid::Parse() support for completeness

Testing:

• All new Parse functions pass the added test cases.
• Existing functionality remains unaffected.

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Examples:

For geometry::Parse

DECLARE @geomText NVARCHAR(MAX);
SET @geomText = 'POINT(1.0 2.0)';
SELECT geometry::Parse(@geomText).STAsText() AS ParsedGeometry;
GO

Output:

ParsedGeometry
--------------
POINT(1 2)

For geography::Parse

DECLARE @geogText NVARCHAR(MAX);
SET @geogText = 'LINESTRING(0 0, 1 1, 2 2)';
SELECT geography::Parse(@geogText).STAsText() AS ParsedGeography;
GO

Output:

ParsedGeography
---------------
LINESTRING(0 0,1 1,2 2)

For Empty Geometry Parsing

DECLARE @emptyPoint NVARCHAR(MAX);
SET @emptyPoint = 'POINT EMPTY';
SELECT geometry::Parse(@emptyPoint).STAsText() AS ParsedGeometry;
GO

Output:

ParsedGeometry
--------------
POINT EMPTY

---

Issues Resolved

BABEL 6339

Signed-off by: Gopalgv gopalgv@amazon.com

Authored by: Gopalgv gopalgv@amazon.com

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Check List

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