1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
|
require 'helper'
module Arel
module Visitors
describe 'the oracle visitor' do
before do
@visitor = Oracle.new Table.engine
end
it 'modifies order when there is distinct and first value' do
# *sigh*
select = "DISTINCT foo.id, FIRST_VALUE(projects.name) OVER (foo) AS alias_0__"
stmt = Nodes::SelectStatement.new
stmt.cores.first.projections << Nodes::SqlLiteral.new(select)
stmt.orders << Nodes::SqlLiteral.new('foo')
sql = @visitor.accept(stmt)
sql.must_be_like %{
SELECT #{select} ORDER BY alias_0__
}
end
it 'is idempotent with crazy query' do
# *sigh*
select = "DISTINCT foo.id, FIRST_VALUE(projects.name) OVER (foo) AS alias_0__"
stmt = Nodes::SelectStatement.new
stmt.cores.first.projections << Nodes::SqlLiteral.new(select)
stmt.orders << Nodes::SqlLiteral.new('foo')
sql = @visitor.accept(stmt)
sql2 = @visitor.accept(stmt)
sql.must_equal sql2
end
it 'splits orders with commas' do
# *sigh*
select = "DISTINCT foo.id, FIRST_VALUE(projects.name) OVER (foo) AS alias_0__"
stmt = Nodes::SelectStatement.new
stmt.cores.first.projections << Nodes::SqlLiteral.new(select)
stmt.orders << Nodes::SqlLiteral.new('foo, bar')
sql = @visitor.accept(stmt)
sql.must_be_like %{
SELECT #{select} ORDER BY alias_0__, alias_1__
}
end
it 'splits orders with commas and function calls' do
# *sigh*
select = "DISTINCT foo.id, FIRST_VALUE(projects.name) OVER (foo) AS alias_0__"
stmt = Nodes::SelectStatement.new
stmt.cores.first.projections << Nodes::SqlLiteral.new(select)
stmt.orders << Nodes::SqlLiteral.new('NVL(LOWER(bar, foo), foo) DESC, UPPER(baz)')
sql = @visitor.accept(stmt)
sql.must_be_like %{
SELECT #{select} ORDER BY alias_0__ DESC, alias_1__
}
end
describe 'Nodes::SelectStatement' do
describe 'limit' do
it 'adds a rownum clause' do
stmt = Nodes::SelectStatement.new
stmt.limit = Nodes::Limit.new(10)
sql = @visitor.accept stmt
sql.must_be_like %{ SELECT WHERE ROWNUM <= 10 }
end
it 'is idempotent' do
stmt = Nodes::SelectStatement.new
stmt.orders << Nodes::SqlLiteral.new('foo')
stmt.limit = Nodes::Limit.new(10)
sql = @visitor.accept stmt
sql2 = @visitor.accept stmt
sql.must_equal sql2
end
it 'creates a subquery when there is order_by' do
stmt = Nodes::SelectStatement.new
stmt.orders << Nodes::SqlLiteral.new('foo')
stmt.limit = Nodes::Limit.new(10)
sql = @visitor.accept stmt
sql.must_be_like %{
SELECT * FROM (SELECT ORDER BY foo) WHERE ROWNUM <= 10
}
end
it 'creates a subquery when there is DISTINCT' do
stmt = Nodes::SelectStatement.new
stmt.cores.first.projections << Nodes::SqlLiteral.new('DISTINCT id')
stmt.limit = Arel::Nodes::Limit.new(10)
sql = @visitor.accept stmt
sql.must_be_like %{
SELECT * FROM (SELECT DISTINCT id) WHERE ROWNUM <= 10
}
end
it 'creates a different subquery when there is an offset' do
stmt = Nodes::SelectStatement.new
stmt.limit = Nodes::Limit.new(10)
stmt.offset = Nodes::Offset.new(10)
sql = @visitor.accept stmt
sql.must_be_like %{
SELECT * FROM (
SELECT raw_sql_.*, rownum raw_rnum_
FROM (SELECT ) raw_sql_
WHERE rownum <= 20
)
WHERE raw_rnum_ > 10
}
end
it 'is idempotent with different subquery' do
stmt = Nodes::SelectStatement.new
stmt.limit = Nodes::Limit.new(10)
stmt.offset = Nodes::Offset.new(10)
sql = @visitor.accept stmt
sql2 = @visitor.accept stmt
sql.must_equal sql2
end
end
describe 'only offset' do
it 'creates a select from subquery with rownum condition' do
stmt = Nodes::SelectStatement.new
stmt.offset = Nodes::Offset.new(10)
sql = @visitor.accept stmt
sql.must_be_like %{
SELECT * FROM (
SELECT raw_sql_.*, rownum raw_rnum_
FROM (SELECT ) raw_sql_
)
WHERE raw_rnum_ > 10
}
end
end
end
it 'modified except to be minus' do
left = Nodes::SqlLiteral.new("SELECT * FROM users WHERE age > 10")
right = Nodes::SqlLiteral.new("SELECT * FROM users WHERE age > 20")
sql = @visitor.accept Nodes::Except.new(left, right)
sql.must_be_like %{
( SELECT * FROM users WHERE age > 10 MINUS SELECT * FROM users WHERE age > 20 )
}
end
end
end
end
|
