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Support BindParams in subqueries
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When an Arel AST contains a SelectManager as a component, e.g. as a CTE
expression, the SelectManager is converted to SQL with `#to_sql`. This
uses a new collector that leads to invalid expressions when using
bind parameters. For example, when generating PostgreSQL queries, the
bind parameter number starts from one again. When using the
SubstituteBinds collector, binds in the subquery are not substituted.
This commit changes the ToSql visitor to visit the SelectManager ast
itself.
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Update .travis.yml
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Add required_ruby_version to gemspec
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travis.yml made it follow Rails (AR). The summary is as follows.
- Drop MRI 2.2.1 or lower and updated with latest MRI versions
- Drop rbx-2. This build has failed since before
- Update JRuby version to 9.1.12.0
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Remove encoding utf-8 magic comment
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Remove Unused variable - offset_bind
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Fixes warning in Rails tests:
```
/home/travis/build/rails/rails/vendor/bundle/ruby/2.4.0/bundler/gems/arel-b9ca36f09d5e/lib/arel/visitors/oracle.rb:32: warning: assigned but unused variable - offset_bind
``
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CI against ruby 2.4.1
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Oracle visitor needs two more `add_bind` argument fix
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Here `offset` is bound twice. It used to be `:b1` appeared twice.
This commit changes the second `offset` name changed from `:b1` to `:b3`
which should not affect the actual bind values for offset.
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Add missing hash, eql?, == to various node classes
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Some of the nodes classes are missing either one or many of the common comparison methods #hash, #eql? and #==.
This makes comparision and working with the ast sometimes painful, as equality or operations likes array differences (which uses a hash behind the scene) produces unexpected results.
A test has been added that ensures that every descendants of Node:
* have all 3 methods
* that all 3 methods were defined from the same class
* that the class defining all 3 is also a descendant of Node, to avoid the default ones that rely on identity only
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Remove unused `bind_values`
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Since https://github.com/rails/rails/commit/213796f, `bind_values` is no
longer used from Active Record.
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We need `value` to have a writer for `StatementCache` to work when
prepared statements are disabled. This is something I'd like to revert
eventually, either by disabling that form of caching in that case or
re-introducing something like the old `Bind` collector.
The addition of `nil?` is to make `IS NULL` be inserted correctly,
similar to what we already do with quoted and casted nodes
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Now that the bind values are being stored on the actual AST, we need a
way to pull them off into the array that we were previously maintaining
separately. This requires a full walk of the AST. This is an expensive
operation, so I've also added a visitor for delegating to more than one
visitor in a single pass.
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Switching from `''.dup` to `String.new` had the side effect of changing
the encoding on Ruby 2.4 and later. Oddly, `String.new(encoding:
Encoding::UTF_8)` is significantly slower than `''.dup`. This seems like
a bug in Ruby, but not something we're going to address right now. A
test has been added to ensure this regression doesn't occur again.
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I'm honestly not sure if replacing bind params with their concrete
values is something that belongs in Arel at all, as it's something that
will need to be coupled to the quoting mechanism of the caller, and
could just be accomplished by using `Quoted` instead.
Still, with the new structure we can provide a much simpler API around
substitution. The expectation of the quoter responding to `quote` is a
reasonably minimal API.
I originally used `DelegateClass` here, with the one line override of
`add_bind`, but realized that we have some funky code going on where the
collector returns the next collector to use (in practice `self` is
always returned, and I don't see why we'd ever want to do this).
Removing that would likely be worthwhile, but would be a larger
refactoring
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This is part of a greater refactoring to have the `BindParam` nodes hold
onto their values. We want to generally keep the AST decoupled from what
you're actually doing with those values, but ultimately the usage of
`BindParam` is almost identical to how you'd use `Casted` or `Quoted`.
Forcing consumers of Arel's API to maintain the bind values separately
from the AST makes manipulating the AST essentially impossible, as you
would need to perform a full walk of the AST to determine whether a
given node contains bind parameters, and which value it maps to.
By storing the value on the bind parameter directly, we can collect them
in another AST pass (realistically it'll be part of the same pass that
performs SQL construction for performance reasons). This will
dramatically simplify AST manipulation for Rails or any other consumers
that work with bind params.
As part of this change I've removed the `BindVisitor`, which appears to
be dead code, and had tests break from this change.
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The "bind collector" does not actually collect bind params at all, it
substitutes them out of the final AST, replacing them with a quoted
value.
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Support INSERT with multiple values (v2)
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Make Visitor visit thread safe by holding dispatch method reference
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Remove unused `engine`
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Follow up of 98fc25991137ee09b6800578117f8c1c322680f2.
`engine` is only used for `to_sql` and `where_sql` now.
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This reverts commit 6d105c7f891a14316eab47dfff3bf1b94f3204e7, reversing
changes made to 437aa3a4bb8ad4f3f4eba299dbb1112852f9c7ac.
This broke Active Record when the values are sql literals
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Support multiple inserts
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Made InsertManager#insert chainable
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docs: add distinct example to README
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named functions compared to nil
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Enable frozen_string_literal in all files in arel
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