fix

[HoseokWon99]

지금까지 공간 인덱스가 사용되고 있지 않음을 발견함
ST_DWithin 함수를 이용하요 공간인덱스 사용하도록 수정

[gemini-code-assist]

Summary of Changes

Hello @HoseokWon99, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

I've identified and addressed an issue where spatial indexes were not being properly utilized for radius-based queries. This pull request introduces a fix by modifying the makeRadiusConditionQuery function to directly employ the ST_DWithin function. This change ensures that the system can now effectively leverage spatial indexes, leading to more efficient and performant geospatial data retrieval.

Highlights

• Spatial Index Utilization: The makeRadiusConditionQuery function was refactored to directly use the ST_DWithin function. This change is crucial as it enables the database to leverage spatial indexes for radius-based queries, significantly improving the performance of geospatial lookups.
• Query Logic Simplification: The previous approach involved calculating the distance using ST_DistanceSphere and then comparing it against a radius. The new implementation with ST_DWithin encapsulates this logic into a single, more efficient spatial function, simplifying the query logic and making it more concise.

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[gemini-code-assist]

Code Review

This pull request correctly refactors the spatial query logic to use ST_DWithin, which is a great improvement for performance as it allows the database to use spatial indexes. My review includes suggestions to enhance the readability and maintainability of the generated SQL queries. Specifically, I've pointed out the use of 'magic numbers' for SRID and unit conversions, and inconsistent code formatting. I've provided suggestions to add comments clarifying these numbers and to fix the indentation for better code clarity.

[gemini-code-assist]

This is a great change to use spatial indexes! To improve readability and maintainability, I have a couple of suggestions:

1. Magic Numbers: The values 4326 (SRID for WGS84) and 1000 (km to m conversion factor) are used directly. It's a good practice to extract these into named constants at the module level, or at least add comments to clarify their purpose.
2. Formatting: The indentation within the template literal is inconsistent, which affects readability.

Here's a suggestion that improves formatting and adds SQL comments to clarify the magic numbers.

Suggested change

	return `ST_DWithin(
	${tableAlias}.${prop},
	ST_SetSRID(ST_MakePoint(:lng, :lat), 4326),
	:radius * 1000
	)`;
	return `ST_DWithin(
	${tableAlias}.${prop},
	ST_SetSRID(ST_MakePoint(:lng, :lat), 4326), -- WGS 84 SRID
	:radius * 1000 -- Convert radius from km to meters
	)`;

[gemini-code-assist]

The formatting of this multi-line template string has inconsistent indentation. Also, the division by the magic number 1000 to convert meters to kilometers could be made clearer. Using a SQL comment can improve readability.

Suggested change

	return `ST_DistanceSphere(
	${tableAlias}.${prop},
	ST_MakePoint(:lng, :lat)
	) / 1000`;
	return `ST_DistanceSphere(
	${tableAlias}.${prop},
	ST_MakePoint(:lng, :lat)
	) / 1000 -- Convert meters to kilometers`;