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Implement default unsigned casting rules for MySQL.

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The following casting rules are now the default for MySQL:

  - type tinyint when unsigned to smallint   drop typemod
  - type smallint when unsigned to integer  drop typemod
  - type mediumint when unsigned to integer  drop typemod
  - type integer when unsigned to bigint    drop typemod

Fixes #678.
This commit is contained in:
Dimitri Fontaine 2017-11-22 10:29:11 -08:00
parent 5c60f8c35c
commit d69b72053a
3 changed files with 31 additions and 3 deletions
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16
pgloader.1
View File

@ -2474,6 +2474,18 @@ type bigint with extra auto_increment to bigserial
type tinyint to boolean when (= 1 precision) using tinyint\-to\-boolean
.
.IP "\(bu" 4
type tinyint when unsigned to smallint drop typemod
.
.IP "\(bu" 4
type smallint when unsigned to integer drop typemod
.
.IP "\(bu" 4
type mediumint when unsigned to integer drop typemod
.
.IP "\(bu" 4
type integer when unsigned to bigint drop typemod
.
.IP "\(bu" 4
type tinyint to smallint drop typemod
.
.IP "\(bu" 4
@ -2486,10 +2498,10 @@ type mediumint to integer drop typemod
type integer to integer drop typemod
.
.IP "\(bu" 4
type float to float drop typemod
type bigint to bigint drop typemod
.
.IP "\(bu" 4
type bigint to bigint drop typemod
type float to float drop typemod
.
.IP "\(bu" 4
type double to double precision drop typemod

8
pgloader.1.md
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@ -2081,12 +2081,18 @@ Numbers:
- type tinyint to boolean when (= 1 precision) using tinyint-to-boolean
- type tinyint when unsigned to smallint drop typemod
- type smallint when unsigned to integer drop typemod
- type mediumint when unsigned to integer drop typemod
- type integer when unsigned to bigint drop typemod
- type tinyint to smallint drop typemod
- type smallint to smallint drop typemod
- type mediumint to integer drop typemod
- type integer to integer drop typemod
- type float to float drop typemod
- type bigint to bigint drop typemod
- type float to float drop typemod
- type double to double precision drop typemod
- type numeric to numeric keep typemod

10
src/sources/mysql/mysql-cast-rules.lisp
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@ -45,6 +45,16 @@
(:source (:type "bigint" :typemod (< 19 precision))
:target (:type "numeric" :drop-typemod t))
;; now unsigned types
(:source (:type "tinyint" :unsigned t)
:target (:type "smallint" :drop-typemod t))
(:source (:type "smallint" :unsigned t)
:target (:type "integer" :drop-typemod t))
(:source (:type "mediumint" :unsigned t)
:target (:type "integer" :drop-typemod t))
(:source (:type "integer" :unsigned t)
:target (:type "bigint" :drop-typemod t))
;; we need the following to benefit from :drop-typemod
(:source (:type "tinyint") :target (:type "smallint" :drop-typemod t))
(:source (:type "smallint") :target (:type "smallint" :drop-typemod t))