Bulk update excessive typecast

[imraan-go]

When using bulk() in NewUpdate(), bun tries to type cast all rows. But in postrgresql, type casting only the first column is enough. Also type casting primitive types such as string,int is not really needed. Here is an example query produced by bun:

WITH "_data" ( "id", "phone_number", "password", "reference_id", "fullname" ) AS (
	VALUES
		( '47b2035b-fce2-4efb-b1ae-7c8882fd5a90' :: VARCHAR, '01716554433' :: VARCHAR, '' :: VARCHAR, 629 :: BIGINT, 'Abdullah' :: VARCHAR ),
		( 'dbfa7e9e-6c55-4b22-b22f-bff2a8014b56' :: VARCHAR, '01716655661' :: VARCHAR, '' :: VARCHAR, 630 :: BIGINT, 'Abdullah' :: VARCHAR ),
		( '8c6cd551-2705-4d23-8dab-c16704a60ce0' :: VARCHAR, '01700000002' :: VARCHAR, '' :: VARCHAR, 631 :: BIGINT, 'Rahman' :: VARCHAR ),
		( 'da5ec352-7862-49ef-8e84-a673d604d567' :: VARCHAR, '0171665566' :: VARCHAR, '' :: VARCHAR, 0 :: BIGINT, '' :: VARCHAR ),
		( '8139128e-4f41-445a-a756-4bd7019b6f86' :: VARCHAR, '01716965566' :: VARCHAR, '' :: VARCHAR, 0 :: BIGINT, '' :: VARCHAR ) 
	) UPDATE "customers" AS "customer" 
	SET "reference_id" = _data."reference_id" 
FROM
	_data 
WHERE
	( "customer"."id" = _data."id" )

This query can be shortened to:

WITH "_data" ( "id", "phone_number", "password", "reference_id", "fullname" ) AS (
	VALUES
		( '47b2035b-fce2-4efb-b1ae-7c8882fd5a90'::uuid , '01716554433' , '' , 629 , 'Abdullah'  ),
		( 'dbfa7e9e-6c55-4b22-b22f-bff2a8014b56' , '01716655661' , '' , 630 , 'Abdullah'  ),
		( '8c6cd551-2705-4d23-8dab-c16704a60ce0' , '01700000002' , '' , 631 , 'Rahman'  ),
		( 'da5ec352-7862-49ef-8e84-a673d604d567' , '0171665566' , '' , 0 , ''  ),
		( '8139128e-4f41-445a-a756-4bd7019b6f86' , '01716965566' , '' , 0 , ''  ) 
	) UPDATE "customers" AS "customer" 
	SET "cin7_reference_id" = _data."reference_id" 
FROM
	_data 
WHERE
	( "customer"."id" = _data."id" )

Also when bun doesn't recognize a type, it tried to typecast it to some random type such as bigint,json etc.

[vmihailenco]

Also type casting primitive types such as string,int is not really needed

PR is welcome :)

it tried to typecast it to some random type such as bigint,json etc.

The type is not random - that is the type Bun auto-discovered from the Go column.

[github-actions]

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