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dialect/sql: reduce the number of joins on neighbors without predicates (#154)

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Summary:
Pull Request resolved: https://github.com/facebookincubator/ent/pull/154

Loading the "form" table is not required where there's no predicate on the join.

Reviewed By: alexsn

Differential Revision: D18421062

fbshipit-source-id: cb2a045a5a8a76ea4f07e5cf4305a6da338a616e
This commit is contained in:
Ariel Mashraki
2019-11-10 21:50:18 -08:00
committed by Facebook Github Bot
parent 514c0ff6d3
commit 73e294a21e
2 changed files with 36 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

35
dialect/sql/graph_test.go
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@@ -159,6 +159,41 @@ func TestNeighbors(t *testing.T) {
wantQuery: "SELECT * FROM `users` JOIN (SELECT `parent_id` FROM `users` WHERE `id` = ?) AS `t1` ON `users`.`id` = `t1`.`parent_id`",
wantArgs: []interface{}{2},
},
{
name: "M2M/2type",
input: func() *Step {
step := &Step{}
step.From.V = 2
step.From.Table = "groups"
step.From.Column = "id"
step.To.Table = "users"
step.To.Column = "id"
step.Edge.Rel = M2M
step.Edge.Table = "user_groups"
step.Edge.Columns = []string{"group_id", "user_id"}
return step
}(),
wantQuery: "SELECT * FROM `users` JOIN (SELECT `user_groups`.`user_id` FROM `user_groups` WHERE `user_groups`.`group_id` = ?) AS `t1` ON `users`.`id` = `t1`.`user_id`",
wantArgs: []interface{}{2},
},
{
name: "M2M/2type/inverse",
input: func() *Step {
step := &Step{}
step.From.V = 2
step.From.Table = "users"
step.From.Column = "id"
step.To.Table = "groups"
step.To.Column = "id"
step.Edge.Rel = M2M
step.Edge.Inverse = true
step.Edge.Table = "user_groups"
step.Edge.Columns = []string{"group_id", "user_id"}
return step
}(),
wantQuery: "SELECT * FROM `groups` JOIN (SELECT `user_groups`.`group_id` FROM `user_groups` WHERE `user_groups`.`user_id` = ?) AS `t1` ON `groups`.`id` = `t1`.`group_id`",
wantArgs: []interface{}{2},
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {