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-rw-r--r--activerecord/lib/arel/collectors/composite.rb3
-rw-r--r--activerecord/lib/arel/collectors/plain_string.rb2
-rw-r--r--activerecord/lib/arel/collectors/sql_string.rb4
-rw-r--r--activerecord/lib/arel/collectors/substitute_binds.rb3
-rw-r--r--activerecord/lib/arel/delete_manager.rb11
-rw-r--r--activerecord/lib/arel/factory_methods.rb4
-rw-r--r--activerecord/lib/arel/nodes/bind_param.rb6
-rw-r--r--activerecord/lib/arel/nodes/delete_statement.rb15
-rw-r--r--activerecord/lib/arel/nodes/equality.rb7
-rw-r--r--activerecord/lib/arel/nodes/node.rb10
-rw-r--r--activerecord/lib/arel/nodes/select_core.rb6
-rw-r--r--activerecord/lib/arel/nodes/unary.rb1
-rw-r--r--activerecord/lib/arel/nodes/update_statement.rb7
-rw-r--r--activerecord/lib/arel/predications.rb8
-rw-r--r--activerecord/lib/arel/select_manager.rb8
-rw-r--r--activerecord/lib/arel/table.rb3
-rw-r--r--activerecord/lib/arel/tree_manager.rb34
-rw-r--r--activerecord/lib/arel/update_manager.rb29
-rw-r--r--activerecord/lib/arel/visitors/depth_first.rb5
-rw-r--r--activerecord/lib/arel/visitors/dot.rb4
-rw-r--r--activerecord/lib/arel/visitors/ibm_db.rb6
-rw-r--r--activerecord/lib/arel/visitors/mssql.rb28
-rw-r--r--activerecord/lib/arel/visitors/mysql.rb96
-rw-r--r--activerecord/lib/arel/visitors/oracle.rb6
-rw-r--r--activerecord/lib/arel/visitors/oracle12.rb6
-rw-r--r--activerecord/lib/arel/visitors/postgresql.rb16
-rw-r--r--activerecord/lib/arel/visitors/sqlite.rb12
-rw-r--r--activerecord/lib/arel/visitors/to_sql.rb186
28 files changed, 328 insertions, 198 deletions
diff --git a/activerecord/lib/arel/collectors/composite.rb b/activerecord/lib/arel/collectors/composite.rb
index d040d8598d..0533544993 100644
--- a/activerecord/lib/arel/collectors/composite.rb
+++ b/activerecord/lib/arel/collectors/composite.rb
@@ -24,8 +24,7 @@ module Arel # :nodoc: all
[left.value, right.value]
end
- protected
-
+ private
attr_reader :left, :right
end
end
diff --git a/activerecord/lib/arel/collectors/plain_string.rb b/activerecord/lib/arel/collectors/plain_string.rb
index 687d7fbf2f..c0e9fff399 100644
--- a/activerecord/lib/arel/collectors/plain_string.rb
+++ b/activerecord/lib/arel/collectors/plain_string.rb
@@ -4,7 +4,7 @@ module Arel # :nodoc: all
module Collectors
class PlainString
def initialize
- @str = "".dup
+ @str = +""
end
def value
diff --git a/activerecord/lib/arel/collectors/sql_string.rb b/activerecord/lib/arel/collectors/sql_string.rb
index c293a89a74..54e1e562c2 100644
--- a/activerecord/lib/arel/collectors/sql_string.rb
+++ b/activerecord/lib/arel/collectors/sql_string.rb
@@ -15,10 +15,6 @@ module Arel # :nodoc: all
@bind_index += 1
self
end
-
- def compile(bvs)
- value
- end
end
end
end
diff --git a/activerecord/lib/arel/collectors/substitute_binds.rb b/activerecord/lib/arel/collectors/substitute_binds.rb
index 3f40eec8a8..4b894bc4b1 100644
--- a/activerecord/lib/arel/collectors/substitute_binds.rb
+++ b/activerecord/lib/arel/collectors/substitute_binds.rb
@@ -21,8 +21,7 @@ module Arel # :nodoc: all
delegate.value
end
- protected
-
+ private
attr_reader :quoter, :delegate
end
end
diff --git a/activerecord/lib/arel/delete_manager.rb b/activerecord/lib/arel/delete_manager.rb
index 2def581009..fdba937d64 100644
--- a/activerecord/lib/arel/delete_manager.rb
+++ b/activerecord/lib/arel/delete_manager.rb
@@ -2,6 +2,8 @@
module Arel # :nodoc: all
class DeleteManager < Arel::TreeManager
+ include TreeManager::StatementMethods
+
def initialize
super
@ast = Nodes::DeleteStatement.new
@@ -12,14 +14,5 @@ module Arel # :nodoc: all
@ast.relation = relation
self
end
-
- def take(limit)
- @ast.limit = Nodes::Limit.new(Nodes.build_quoted(limit)) if limit
- self
- end
-
- def wheres=(list)
- @ast.wheres = list
- end
end
end
diff --git a/activerecord/lib/arel/factory_methods.rb b/activerecord/lib/arel/factory_methods.rb
index b828bc274e..83ec23e403 100644
--- a/activerecord/lib/arel/factory_methods.rb
+++ b/activerecord/lib/arel/factory_methods.rb
@@ -41,5 +41,9 @@ module Arel # :nodoc: all
def lower(column)
Nodes::NamedFunction.new "LOWER", [Nodes.build_quoted(column)]
end
+
+ def coalesce(*exprs)
+ Nodes::NamedFunction.new "COALESCE", exprs
+ end
end
end
diff --git a/activerecord/lib/arel/nodes/bind_param.rb b/activerecord/lib/arel/nodes/bind_param.rb
index 53c5563d93..ba8340558a 100644
--- a/activerecord/lib/arel/nodes/bind_param.rb
+++ b/activerecord/lib/arel/nodes/bind_param.rb
@@ -3,7 +3,7 @@
module Arel # :nodoc: all
module Nodes
class BindParam < Node
- attr_accessor :value
+ attr_reader :value
def initialize(value)
@value = value
@@ -23,6 +23,10 @@ module Arel # :nodoc: all
def nil?
value.nil?
end
+
+ def boundable?
+ !value.respond_to?(:boundable?) || value.boundable?
+ end
end
end
end
diff --git a/activerecord/lib/arel/nodes/delete_statement.rb b/activerecord/lib/arel/nodes/delete_statement.rb
index eaac05e2f6..a419975335 100644
--- a/activerecord/lib/arel/nodes/delete_statement.rb
+++ b/activerecord/lib/arel/nodes/delete_statement.rb
@@ -3,8 +3,7 @@
module Arel # :nodoc: all
module Nodes
class DeleteStatement < Arel::Nodes::Node
- attr_accessor :left, :right
- attr_accessor :limit
+ attr_accessor :left, :right, :orders, :limit, :offset, :key
alias :relation :left
alias :relation= :left=
@@ -15,6 +14,10 @@ module Arel # :nodoc: all
super()
@left = relation
@right = wheres
+ @orders = []
+ @limit = nil
+ @offset = nil
+ @key = nil
end
def initialize_copy(other)
@@ -24,13 +27,17 @@ module Arel # :nodoc: all
end
def hash
- [self.class, @left, @right].hash
+ [self.class, @left, @right, @orders, @limit, @offset, @key].hash
end
def eql?(other)
self.class == other.class &&
self.left == other.left &&
- self.right == other.right
+ self.right == other.right &&
+ self.orders == other.orders &&
+ self.limit == other.limit &&
+ self.offset == other.offset &&
+ self.key == other.key
end
alias :== :eql?
end
diff --git a/activerecord/lib/arel/nodes/equality.rb b/activerecord/lib/arel/nodes/equality.rb
index 2aa85a977e..551d56c2ff 100644
--- a/activerecord/lib/arel/nodes/equality.rb
+++ b/activerecord/lib/arel/nodes/equality.rb
@@ -7,5 +7,12 @@ module Arel # :nodoc: all
alias :operand1 :left
alias :operand2 :right
end
+
+ %w{
+ IsDistinctFrom
+ IsNotDistinctFrom
+ }.each do |name|
+ const_set name, Class.new(Equality)
+ end
end
end
diff --git a/activerecord/lib/arel/nodes/node.rb b/activerecord/lib/arel/nodes/node.rb
index 2b9b1e9828..8086102bde 100644
--- a/activerecord/lib/arel/nodes/node.rb
+++ b/activerecord/lib/arel/nodes/node.rb
@@ -8,16 +8,6 @@ module Arel # :nodoc: all
include Arel::FactoryMethods
include Enumerable
- if $DEBUG
- def _caller
- @caller
- end
-
- def initialize
- @caller = caller.dup
- end
- end
-
###
# Factory method to create a Nodes::Not node that has the recipient of
# the caller as a child.
diff --git a/activerecord/lib/arel/nodes/select_core.rb b/activerecord/lib/arel/nodes/select_core.rb
index 2defe61974..73461ff683 100644
--- a/activerecord/lib/arel/nodes/select_core.rb
+++ b/activerecord/lib/arel/nodes/select_core.rb
@@ -3,13 +3,12 @@
module Arel # :nodoc: all
module Nodes
class SelectCore < Arel::Nodes::Node
- attr_accessor :top, :projections, :wheres, :groups, :windows
+ attr_accessor :projections, :wheres, :groups, :windows
attr_accessor :havings, :source, :set_quantifier
def initialize
super()
@source = JoinSource.new nil
- @top = nil
# https://ronsavage.github.io/SQL/sql-92.bnf.html#set%20quantifier
@set_quantifier = nil
@@ -43,7 +42,7 @@ module Arel # :nodoc: all
def hash
[
- @source, @top, @set_quantifier, @projections,
+ @source, @set_quantifier, @projections,
@wheres, @groups, @havings, @windows
].hash
end
@@ -51,7 +50,6 @@ module Arel # :nodoc: all
def eql?(other)
self.class == other.class &&
self.source == other.source &&
- self.top == other.top &&
self.set_quantifier == other.set_quantifier &&
self.projections == other.projections &&
self.wheres == other.wheres &&
diff --git a/activerecord/lib/arel/nodes/unary.rb b/activerecord/lib/arel/nodes/unary.rb
index a3c0045897..00639304e4 100644
--- a/activerecord/lib/arel/nodes/unary.rb
+++ b/activerecord/lib/arel/nodes/unary.rb
@@ -37,7 +37,6 @@ module Arel # :nodoc: all
On
Ordering
RollUp
- Top
}.each do |name|
const_set(name, Class.new(Unary))
end
diff --git a/activerecord/lib/arel/nodes/update_statement.rb b/activerecord/lib/arel/nodes/update_statement.rb
index 5184b1180f..cfaa19e392 100644
--- a/activerecord/lib/arel/nodes/update_statement.rb
+++ b/activerecord/lib/arel/nodes/update_statement.rb
@@ -3,8 +3,7 @@
module Arel # :nodoc: all
module Nodes
class UpdateStatement < Arel::Nodes::Node
- attr_accessor :relation, :wheres, :values, :orders, :limit
- attr_accessor :key
+ attr_accessor :relation, :wheres, :values, :orders, :limit, :offset, :key
def initialize
@relation = nil
@@ -12,6 +11,7 @@ module Arel # :nodoc: all
@values = []
@orders = []
@limit = nil
+ @offset = nil
@key = nil
end
@@ -22,7 +22,7 @@ module Arel # :nodoc: all
end
def hash
- [@relation, @wheres, @values, @orders, @limit, @key].hash
+ [@relation, @wheres, @values, @orders, @limit, @offset, @key].hash
end
def eql?(other)
@@ -32,6 +32,7 @@ module Arel # :nodoc: all
self.values == other.values &&
self.orders == other.orders &&
self.limit == other.limit &&
+ self.offset == other.offset &&
self.key == other.key
end
alias :== :eql?
diff --git a/activerecord/lib/arel/predications.rb b/activerecord/lib/arel/predications.rb
index e83a6f162f..77502dd199 100644
--- a/activerecord/lib/arel/predications.rb
+++ b/activerecord/lib/arel/predications.rb
@@ -18,6 +18,14 @@ module Arel # :nodoc: all
Nodes::Equality.new self, quoted_node(other)
end
+ def is_not_distinct_from(other)
+ Nodes::IsNotDistinctFrom.new self, quoted_node(other)
+ end
+
+ def is_distinct_from(other)
+ Nodes::IsDistinctFrom.new self, quoted_node(other)
+ end
+
def eq_any(others)
grouping_any :eq, others
end
diff --git a/activerecord/lib/arel/select_manager.rb b/activerecord/lib/arel/select_manager.rb
index 22a04b00c6..a2b2838a3d 100644
--- a/activerecord/lib/arel/select_manager.rb
+++ b/activerecord/lib/arel/select_manager.rb
@@ -222,10 +222,8 @@ module Arel # :nodoc: all
def take(limit)
if limit
@ast.limit = Nodes::Limit.new(limit)
- @ctx.top = Nodes::Top.new(limit)
else
@ast.limit = nil
- @ctx.top = nil
end
self
end
@@ -252,9 +250,9 @@ module Arel # :nodoc: all
end
private
- def collapse(exprs, existing = nil)
- exprs = exprs.unshift(existing.expr) if existing
- exprs = exprs.compact.map { |expr|
+ def collapse(exprs)
+ exprs = exprs.compact
+ exprs.map! { |expr|
if String === expr
# FIXME: Don't do this automatically
Arel.sql(expr)
diff --git a/activerecord/lib/arel/table.rb b/activerecord/lib/arel/table.rb
index 686fcdf962..c40c68715a 100644
--- a/activerecord/lib/arel/table.rb
+++ b/activerecord/lib/arel/table.rb
@@ -104,8 +104,7 @@ module Arel # :nodoc: all
!type_caster.nil?
end
- protected
-
+ private
attr_reader :type_caster
end
end
diff --git a/activerecord/lib/arel/tree_manager.rb b/activerecord/lib/arel/tree_manager.rb
index ed47b09a37..0476399618 100644
--- a/activerecord/lib/arel/tree_manager.rb
+++ b/activerecord/lib/arel/tree_manager.rb
@@ -4,6 +4,40 @@ module Arel # :nodoc: all
class TreeManager
include Arel::FactoryMethods
+ module StatementMethods
+ def take(limit)
+ @ast.limit = Nodes::Limit.new(Nodes.build_quoted(limit)) if limit
+ self
+ end
+
+ def offset(offset)
+ @ast.offset = Nodes::Offset.new(Nodes.build_quoted(offset)) if offset
+ self
+ end
+
+ def order(*expr)
+ @ast.orders = expr
+ self
+ end
+
+ def key=(key)
+ @ast.key = Nodes.build_quoted(key)
+ end
+
+ def key
+ @ast.key
+ end
+
+ def wheres=(exprs)
+ @ast.wheres = exprs
+ end
+
+ def where(expr)
+ @ast.wheres << expr
+ self
+ end
+ end
+
attr_reader :ast
def initialize
diff --git a/activerecord/lib/arel/update_manager.rb b/activerecord/lib/arel/update_manager.rb
index fe444343ba..a809dbb307 100644
--- a/activerecord/lib/arel/update_manager.rb
+++ b/activerecord/lib/arel/update_manager.rb
@@ -2,30 +2,14 @@
module Arel # :nodoc: all
class UpdateManager < Arel::TreeManager
+ include TreeManager::StatementMethods
+
def initialize
super
@ast = Nodes::UpdateStatement.new
@ctx = @ast
end
- def take(limit)
- @ast.limit = Nodes::Limit.new(Nodes.build_quoted(limit)) if limit
- self
- end
-
- def key=(key)
- @ast.key = Nodes.build_quoted(key)
- end
-
- def key
- @ast.key
- end
-
- def order(*expr)
- @ast.orders = expr
- self
- end
-
###
# UPDATE +table+
def table(table)
@@ -33,15 +17,6 @@ module Arel # :nodoc: all
self
end
- def wheres=(exprs)
- @ast.wheres = exprs
- end
-
- def where(expr)
- @ast.wheres << expr
- self
- end
-
def set(values)
if String === values
@ast.values = [values]
diff --git a/activerecord/lib/arel/visitors/depth_first.rb b/activerecord/lib/arel/visitors/depth_first.rb
index bcf8f8f980..92d309453c 100644
--- a/activerecord/lib/arel/visitors/depth_first.rb
+++ b/activerecord/lib/arel/visitors/depth_first.rb
@@ -34,7 +34,6 @@ module Arel # :nodoc: all
alias :visit_Arel_Nodes_Ordering :unary
alias :visit_Arel_Nodes_Ascending :unary
alias :visit_Arel_Nodes_Descending :unary
- alias :visit_Arel_Nodes_Top :unary
alias :visit_Arel_Nodes_UnqualifiedColumn :unary
def function(o)
@@ -96,6 +95,8 @@ module Arel # :nodoc: all
alias :visit_Arel_Nodes_NotEqual :binary
alias :visit_Arel_Nodes_NotIn :binary
alias :visit_Arel_Nodes_NotRegexp :binary
+ alias :visit_Arel_Nodes_IsNotDistinctFrom :binary
+ alias :visit_Arel_Nodes_IsDistinctFrom :binary
alias :visit_Arel_Nodes_Or :binary
alias :visit_Arel_Nodes_OuterJoin :binary
alias :visit_Arel_Nodes_Regexp :binary
@@ -136,12 +137,10 @@ module Arel # :nodoc: all
alias :visit_Arel_Nodes_True :terminal
alias :visit_Arel_Nodes_False :terminal
alias :visit_BigDecimal :terminal
- alias :visit_Bignum :terminal
alias :visit_Class :terminal
alias :visit_Date :terminal
alias :visit_DateTime :terminal
alias :visit_FalseClass :terminal
- alias :visit_Fixnum :terminal
alias :visit_Float :terminal
alias :visit_Integer :terminal
alias :visit_NilClass :terminal
diff --git a/activerecord/lib/arel/visitors/dot.rb b/activerecord/lib/arel/visitors/dot.rb
index d352b81914..6389c875cb 100644
--- a/activerecord/lib/arel/visitors/dot.rb
+++ b/activerecord/lib/arel/visitors/dot.rb
@@ -81,7 +81,6 @@ module Arel # :nodoc: all
alias :visit_Arel_Nodes_Not :unary
alias :visit_Arel_Nodes_Offset :unary
alias :visit_Arel_Nodes_On :unary
- alias :visit_Arel_Nodes_Top :unary
alias :visit_Arel_Nodes_UnqualifiedColumn :unary
alias :visit_Arel_Nodes_Preceding :unary
alias :visit_Arel_Nodes_Following :unary
@@ -196,6 +195,8 @@ module Arel # :nodoc: all
alias :visit_Arel_Nodes_JoinSource :binary
alias :visit_Arel_Nodes_LessThan :binary
alias :visit_Arel_Nodes_LessThanOrEqual :binary
+ alias :visit_Arel_Nodes_IsNotDistinctFrom :binary
+ alias :visit_Arel_Nodes_IsDistinctFrom :binary
alias :visit_Arel_Nodes_Matches :binary
alias :visit_Arel_Nodes_NotEqual :binary
alias :visit_Arel_Nodes_NotIn :binary
@@ -212,7 +213,6 @@ module Arel # :nodoc: all
alias :visit_TrueClass :visit_String
alias :visit_FalseClass :visit_String
alias :visit_Integer :visit_String
- alias :visit_Fixnum :visit_String
alias :visit_BigDecimal :visit_String
alias :visit_Float :visit_String
alias :visit_Symbol :visit_String
diff --git a/activerecord/lib/arel/visitors/ibm_db.rb b/activerecord/lib/arel/visitors/ibm_db.rb
index 0a06aef60b..73166054da 100644
--- a/activerecord/lib/arel/visitors/ibm_db.rb
+++ b/activerecord/lib/arel/visitors/ibm_db.rb
@@ -10,6 +10,12 @@ module Arel # :nodoc: all
collector = visit o.expr, collector
collector << " ROWS ONLY"
end
+
+ def is_distinct_from(o, collector)
+ collector << "DECODE("
+ collector = visit [o.left, o.right, 0, 1], collector
+ collector << ")"
+ end
end
end
end
diff --git a/activerecord/lib/arel/visitors/mssql.rb b/activerecord/lib/arel/visitors/mssql.rb
index 9aedc51d15..fdd864b40d 100644
--- a/activerecord/lib/arel/visitors/mssql.rb
+++ b/activerecord/lib/arel/visitors/mssql.rb
@@ -12,11 +12,29 @@ module Arel # :nodoc: all
private
- # `top` wouldn't really work here. I.e. User.select("distinct first_name").limit(10) would generate
- # "select top 10 distinct first_name from users", which is invalid query! it should be
- # "select distinct top 10 first_name from users"
- def visit_Arel_Nodes_Top(o)
- ""
+ def visit_Arel_Nodes_IsNotDistinctFrom(o, collector)
+ right = o.right
+
+ if right.nil?
+ collector = visit o.left, collector
+ collector << " IS NULL"
+ else
+ collector << "EXISTS (VALUES ("
+ collector = visit o.left, collector
+ collector << ") INTERSECT VALUES ("
+ collector = visit right, collector
+ collector << "))"
+ end
+ end
+
+ def visit_Arel_Nodes_IsDistinctFrom(o, collector)
+ if o.right.nil?
+ collector = visit o.left, collector
+ collector << " IS NOT NULL"
+ else
+ collector << "NOT "
+ visit_Arel_Nodes_IsNotDistinctFrom o, collector
+ end
end
def visit_Arel_Visitors_MSSQL_RowNumber(o, collector)
diff --git a/activerecord/lib/arel/visitors/mysql.rb b/activerecord/lib/arel/visitors/mysql.rb
index 37bfb661f0..dd77cfdf66 100644
--- a/activerecord/lib/arel/visitors/mysql.rb
+++ b/activerecord/lib/arel/visitors/mysql.rb
@@ -4,39 +4,15 @@ module Arel # :nodoc: all
module Visitors
class MySQL < Arel::Visitors::ToSql
private
- def visit_Arel_Nodes_Union(o, collector, suppress_parens = false)
- unless suppress_parens
- collector << "( "
- end
-
- collector = case o.left
- when Arel::Nodes::Union
- visit_Arel_Nodes_Union o.left, collector, true
- else
- visit o.left, collector
- end
-
- collector << " UNION "
-
- collector = case o.right
- when Arel::Nodes::Union
- visit_Arel_Nodes_Union o.right, collector, true
- else
- visit o.right, collector
- end
-
- if suppress_parens
- collector
- else
- collector << " )"
- end
- end
-
def visit_Arel_Nodes_Bin(o, collector)
collector << "BINARY "
visit o.expr, collector
end
+ def visit_Arel_Nodes_UnqualifiedColumn(o, collector)
+ visit o.expr, collector
+ end
+
###
# :'(
# http://dev.mysql.com/doc/refman/5.0/en/select.html#id3482214
@@ -52,28 +28,6 @@ module Arel # :nodoc: all
super
end
- def visit_Arel_Nodes_UpdateStatement(o, collector)
- collector << "UPDATE "
- collector = visit o.relation, collector
-
- unless o.values.empty?
- collector << " SET "
- collector = inject_join o.values, collector, ", "
- end
-
- unless o.wheres.empty?
- collector << " WHERE "
- collector = inject_join o.wheres, collector, " AND "
- end
-
- unless o.orders.empty?
- collector << " ORDER BY "
- collector = inject_join o.orders, collector, ", "
- end
-
- maybe_visit o.limit, collector
- end
-
def visit_Arel_Nodes_Concat(o, collector)
collector << " CONCAT("
visit o.left, collector
@@ -82,6 +36,48 @@ module Arel # :nodoc: all
collector << ") "
collector
end
+
+ def visit_Arel_Nodes_IsNotDistinctFrom(o, collector)
+ collector = visit o.left, collector
+ collector << " <=> "
+ visit o.right, collector
+ end
+
+ def visit_Arel_Nodes_IsDistinctFrom(o, collector)
+ collector << "NOT "
+ visit_Arel_Nodes_IsNotDistinctFrom o, collector
+ end
+
+ # In the simple case, MySQL allows us to place JOINs directly into the UPDATE
+ # query. However, this does not allow for LIMIT, OFFSET and ORDER. To support
+ # these, we must use a subquery.
+ def prepare_update_statement(o)
+ if o.offset || has_join_sources?(o) && has_limit_or_offset_or_orders?(o)
+ super
+ else
+ o
+ end
+ end
+ alias :prepare_delete_statement :prepare_update_statement
+
+ # MySQL is too stupid to create a temporary table for use subquery, so we have
+ # to give it some prompting in the form of a subsubquery.
+ def build_subselect(key, o)
+ subselect = super
+
+ # Materialize subquery by adding distinct
+ # to work with MySQL 5.7.6 which sets optimizer_switch='derived_merge=on'
+ unless has_limit_or_offset_or_orders?(subselect)
+ core = subselect.cores.last
+ core.set_quantifier = Arel::Nodes::Distinct.new
+ end
+
+ Nodes::SelectStatement.new.tap do |stmt|
+ core = stmt.cores.last
+ core.froms = Nodes::Grouping.new(subselect).as("__active_record_temp")
+ core.projections = [Arel.sql(quote_column_name(key.name))]
+ end
+ end
end
end
end
diff --git a/activerecord/lib/arel/visitors/oracle.rb b/activerecord/lib/arel/visitors/oracle.rb
index 30a1529d46..f96bf65ee5 100644
--- a/activerecord/lib/arel/visitors/oracle.rb
+++ b/activerecord/lib/arel/visitors/oracle.rb
@@ -148,6 +148,12 @@ module Arel # :nodoc: all
def visit_Arel_Nodes_BindParam(o, collector)
collector.add_bind(o.value) { |i| ":a#{i}" }
end
+
+ def is_distinct_from(o, collector)
+ collector << "DECODE("
+ collector = visit [o.left, o.right, 0, 1], collector
+ collector << ")"
+ end
end
end
end
diff --git a/activerecord/lib/arel/visitors/oracle12.rb b/activerecord/lib/arel/visitors/oracle12.rb
index 7061f06087..b092aa95e0 100644
--- a/activerecord/lib/arel/visitors/oracle12.rb
+++ b/activerecord/lib/arel/visitors/oracle12.rb
@@ -56,6 +56,12 @@ module Arel # :nodoc: all
def visit_Arel_Nodes_BindParam(o, collector)
collector.add_bind(o.value) { |i| ":a#{i}" }
end
+
+ def is_distinct_from(o, collector)
+ collector << "DECODE("
+ collector = visit [o.left, o.right, 0, 1], collector
+ collector << ")"
+ end
end
end
end
diff --git a/activerecord/lib/arel/visitors/postgresql.rb b/activerecord/lib/arel/visitors/postgresql.rb
index 108ee431ee..920776b4dc 100644
--- a/activerecord/lib/arel/visitors/postgresql.rb
+++ b/activerecord/lib/arel/visitors/postgresql.rb
@@ -5,7 +5,7 @@ module Arel # :nodoc: all
class PostgreSQL < Arel::Visitors::ToSql
CUBE = "CUBE"
ROLLUP = "ROLLUP"
- GROUPING_SET = "GROUPING SET"
+ GROUPING_SETS = "GROUPING SETS"
LATERAL = "LATERAL"
private
@@ -67,7 +67,7 @@ module Arel # :nodoc: all
end
def visit_Arel_Nodes_GroupingSet(o, collector)
- collector << GROUPING_SET
+ collector << GROUPING_SETS
grouping_array_or_grouping_element o, collector
end
@@ -77,6 +77,18 @@ module Arel # :nodoc: all
grouping_parentheses o, collector
end
+ def visit_Arel_Nodes_IsNotDistinctFrom(o, collector)
+ collector = visit o.left, collector
+ collector << " IS NOT DISTINCT FROM "
+ visit o.right, collector
+ end
+
+ def visit_Arel_Nodes_IsDistinctFrom(o, collector)
+ collector = visit o.left, collector
+ collector << " IS DISTINCT FROM "
+ visit o.right, collector
+ end
+
# Used by Lateral visitor to enclose select queries in parentheses
def grouping_parentheses(o, collector)
if o.expr.is_a? Nodes::SelectStatement
diff --git a/activerecord/lib/arel/visitors/sqlite.rb b/activerecord/lib/arel/visitors/sqlite.rb
index cb1d2424ad..af6f7e856a 100644
--- a/activerecord/lib/arel/visitors/sqlite.rb
+++ b/activerecord/lib/arel/visitors/sqlite.rb
@@ -22,6 +22,18 @@ module Arel # :nodoc: all
def visit_Arel_Nodes_False(o, collector)
collector << "0"
end
+
+ def visit_Arel_Nodes_IsNotDistinctFrom(o, collector)
+ collector = visit o.left, collector
+ collector << " IS "
+ visit o.right, collector
+ end
+
+ def visit_Arel_Nodes_IsDistinctFrom(o, collector)
+ collector = visit o.left, collector
+ collector << " IS NOT "
+ visit o.right, collector
+ end
end
end
end
diff --git a/activerecord/lib/arel/visitors/to_sql.rb b/activerecord/lib/arel/visitors/to_sql.rb
index 5986fd5576..f9fe4404eb 100644
--- a/activerecord/lib/arel/visitors/to_sql.rb
+++ b/activerecord/lib/arel/visitors/to_sql.rb
@@ -67,55 +67,39 @@ module Arel # :nodoc: all
@connection = connection
end
- def compile(node, &block)
- accept(node, Arel::Collectors::SQLString.new, &block).value
+ def compile(node, collector = Arel::Collectors::SQLString.new)
+ accept(node, collector).value
end
private
def visit_Arel_Nodes_DeleteStatement(o, collector)
- collector << "DELETE FROM "
- collector = visit o.relation, collector
- if o.wheres.any?
- collector << WHERE
- collector = inject_join o.wheres, collector, AND
+ o = prepare_delete_statement(o)
+
+ if has_join_sources?(o)
+ collector << "DELETE "
+ visit o.relation.left, collector
+ collector << " FROM "
+ else
+ collector << "DELETE FROM "
end
+ collector = visit o.relation, collector
+ collect_nodes_for o.wheres, collector, " WHERE ", " AND "
+ collect_nodes_for o.orders, collector, " ORDER BY "
maybe_visit o.limit, collector
end
- # FIXME: we should probably have a 2-pass visitor for this
- def build_subselect(key, o)
- stmt = Nodes::SelectStatement.new
- core = stmt.cores.first
- core.froms = o.relation
- core.wheres = o.wheres
- core.projections = [key]
- stmt.limit = o.limit
- stmt.orders = o.orders
- stmt
- end
-
def visit_Arel_Nodes_UpdateStatement(o, collector)
- if o.orders.empty? && o.limit.nil?
- wheres = o.wheres
- else
- wheres = [Nodes::In.new(o.key, [build_subselect(o.key, o)])]
- end
+ o = prepare_update_statement(o)
collector << "UPDATE "
collector = visit o.relation, collector
- unless o.values.empty?
- collector << " SET "
- collector = inject_join o.values, collector, ", "
- end
-
- unless wheres.empty?
- collector << " WHERE "
- collector = inject_join wheres, collector, " AND "
- end
+ collect_nodes_for o.values, collector, " SET "
- collector
+ collect_nodes_for o.wheres, collector, " WHERE ", " AND "
+ collect_nodes_for o.orders, collector, " ORDER BY "
+ maybe_visit o.limit, collector
end
def visit_Arel_Nodes_InsertStatement(o, collector)
@@ -237,8 +221,6 @@ module Arel # :nodoc: all
def visit_Arel_Nodes_SelectCore(o, collector)
collector << "SELECT"
- collector = maybe_visit o.top, collector
-
collector = maybe_visit o.set_quantifier, collector
collect_nodes_for o.projections, collector, SPACE
@@ -250,10 +232,7 @@ module Arel # :nodoc: all
collect_nodes_for o.wheres, collector, WHERE, AND
collect_nodes_for o.groups, collector, GROUP_BY
- unless o.havings.empty?
- collector << " HAVING "
- inject_join o.havings, collector, AND
- end
+ collect_nodes_for o.havings, collector, " HAVING ", AND
collect_nodes_for o.windows, collector, WINDOW
collector
@@ -262,11 +241,7 @@ module Arel # :nodoc: all
def collect_nodes_for(nodes, collector, spacer, connector = COMMA)
unless nodes.empty?
collector << spacer
- len = nodes.length - 1
- nodes.each_with_index do |x, i|
- collector = visit(x, collector)
- collector << connector unless len == i
- end
+ inject_join nodes, collector, connector
end
end
@@ -293,13 +268,11 @@ module Arel # :nodoc: all
end
def visit_Arel_Nodes_Union(o, collector)
- collector << "( "
- infix_value(o, collector, " UNION ") << " )"
+ infix_value_with_paren(o, collector, " UNION ")
end
def visit_Arel_Nodes_UnionAll(o, collector)
- collector << "( "
- infix_value(o, collector, " UNION ALL ") << " )"
+ infix_value_with_paren(o, collector, " UNION ALL ")
end
def visit_Arel_Nodes_Intersect(o, collector)
@@ -321,10 +294,7 @@ module Arel # :nodoc: all
def visit_Arel_Nodes_Window(o, collector)
collector << "("
- if o.partitions.any?
- collector << "PARTITION BY "
- collector = inject_join o.partitions, collector, ", "
- end
+ collect_nodes_for o.partitions, collector, "PARTITION BY "
if o.orders.any?
collector << SPACE if o.partitions.any?
@@ -405,11 +375,6 @@ module Arel # :nodoc: all
visit o.expr, collector
end
- # FIXME: this does nothing on most databases, but does on MSSQL
- def visit_Arel_Nodes_Top(o, collector)
- collector
- end
-
def visit_Arel_Nodes_Lock(o, collector)
visit o.expr, collector
end
@@ -612,6 +577,10 @@ module Arel # :nodoc: all
end
def visit_Arel_Nodes_In(o, collector)
+ if Array === o.right && !o.right.empty?
+ o.right.keep_if { |value| boundable?(value) }
+ end
+
if Array === o.right && o.right.empty?
collector << "1=0"
else
@@ -622,6 +591,10 @@ module Arel # :nodoc: all
end
def visit_Arel_Nodes_NotIn(o, collector)
+ if Array === o.right && !o.right.empty?
+ o.right.keep_if { |value| boundable?(value) }
+ end
+
if Array === o.right && o.right.empty?
collector << "1=1"
else
@@ -644,7 +617,7 @@ module Arel # :nodoc: all
def visit_Arel_Nodes_Assignment(o, collector)
case o.right
- when Arel::Nodes::UnqualifiedColumn, Arel::Attributes::Attribute, Arel::Nodes::BindParam
+ when Arel::Nodes::Node, Arel::Attributes::Attribute
collector = visit o.left, collector
collector << " = "
visit o.right, collector
@@ -668,6 +641,26 @@ module Arel # :nodoc: all
end
end
+ def visit_Arel_Nodes_IsNotDistinctFrom(o, collector)
+ if o.right.nil?
+ collector = visit o.left, collector
+ collector << " IS NULL"
+ else
+ collector = is_distinct_from(o, collector)
+ collector << " = 0"
+ end
+ end
+
+ def visit_Arel_Nodes_IsDistinctFrom(o, collector)
+ if o.right.nil?
+ collector = visit o.left, collector
+ collector << " IS NOT NULL"
+ else
+ collector = is_distinct_from(o, collector)
+ collector << " = 1"
+ end
+ end
+
def visit_Arel_Nodes_NotEqual(o, collector)
right = o.right
@@ -739,8 +732,6 @@ module Arel # :nodoc: all
end
alias :visit_Arel_Nodes_SqlLiteral :literal
- alias :visit_Bignum :literal
- alias :visit_Fixnum :literal
alias :visit_Integer :literal
def quoted(o, a)
@@ -823,12 +814,72 @@ module Arel # :nodoc: all
}
end
+ def boundable?(value)
+ !value.respond_to?(:boundable?) || value.boundable?
+ end
+
+ def has_join_sources?(o)
+ o.relation.is_a?(Nodes::JoinSource) && !o.relation.right.empty?
+ end
+
+ def has_limit_or_offset_or_orders?(o)
+ o.limit || o.offset || !o.orders.empty?
+ end
+
+ # The default strategy for an UPDATE with joins is to use a subquery. This doesn't work
+ # on MySQL (even when aliasing the tables), but MySQL allows using JOIN directly in
+ # an UPDATE statement, so in the MySQL visitor we redefine this to do that.
+ def prepare_update_statement(o)
+ if o.key && (has_limit_or_offset_or_orders?(o) || has_join_sources?(o))
+ stmt = o.clone
+ stmt.limit = nil
+ stmt.offset = nil
+ stmt.orders = []
+ stmt.wheres = [Nodes::In.new(o.key, [build_subselect(o.key, o)])]
+ stmt.relation = o.relation.left if has_join_sources?(o)
+ stmt
+ else
+ o
+ end
+ end
+ alias :prepare_delete_statement :prepare_update_statement
+
+ # FIXME: we should probably have a 2-pass visitor for this
+ def build_subselect(key, o)
+ stmt = Nodes::SelectStatement.new
+ core = stmt.cores.first
+ core.froms = o.relation
+ core.wheres = o.wheres
+ core.projections = [key]
+ stmt.limit = o.limit
+ stmt.offset = o.offset
+ stmt.orders = o.orders
+ stmt
+ end
+
def infix_value(o, collector, value)
collector = visit o.left, collector
collector << value
visit o.right, collector
end
+ def infix_value_with_paren(o, collector, value, suppress_parens = false)
+ collector << "( " unless suppress_parens
+ collector = if o.left.class == o.class
+ infix_value_with_paren(o.left, collector, value, true)
+ else
+ visit o.left, collector
+ end
+ collector << value
+ collector = if o.right.class == o.class
+ infix_value_with_paren(o.right, collector, value, true)
+ else
+ visit o.right, collector
+ end
+ collector << " )" unless suppress_parens
+ collector
+ end
+
def aggregate(name, o, collector)
collector << "#{name}("
if o.distinct
@@ -842,6 +893,19 @@ module Arel # :nodoc: all
collector
end
end
+
+ def is_distinct_from(o, collector)
+ collector << "CASE WHEN "
+ collector = visit o.left, collector
+ collector << " = "
+ collector = visit o.right, collector
+ collector << " OR ("
+ collector = visit o.left, collector
+ collector << " IS NULL AND "
+ collector = visit o.right, collector
+ collector << " IS NULL)"
+ collector << " THEN 0 ELSE 1 END"
+ end
end
end
end