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[query] Delete Bindings, AggEnv and GenericBindingEnv - #15924

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@ehigham ehigham commented Oct 30, 2026 •

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Stack 7 of 7. Based on #15923.

Why

Part of a stack that writes IR scoping once, as functions of the bound values, so the
planned abstract interpretation driver can share it with every other pass. #15918 has
the full motivation.

After #15923 nothing calls the old scoping code.

Summary

Nothing calls the old scoping code.

 Binds.scala
-  AggEnv, Bindings (get, applyRecord, inFreshScope, childEnv*)
 Env.scala
-  GenericBindingEnv; BindingEnv.extend, subtract, bindRelational; unused helpers
 TableType, MatrixType
-  IndexedSeq[Int] binding helpers
 IRSuite
-  testChildEnvAgreesWithBindings

The IR checklist now names ChildEnv and Binds.

🤖 Generated with Claude Code

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Walkthrough

The change removes Bindings, AggEnv, GenericBindingEnv, and related binding helpers. It updates the IR checklist and nesting-depth comment to refer to ChildEnv, and removes a test that compared child environments.

Changes: IR binding cleanup

Layer / File(s) Summary
Remove legacy binding APIs
hail/hail/src/is/hail/expr/ir/Binds.scala, hail/hail/src/is/hail/expr/ir/Env.scala, hail/hail/src/is/hail/types/virtual/MatrixType.scala, hail/hail/src/is/hail/types/virtual/TableType.scala
Removes Bindings, AggEnv, GenericBindingEnv, related BindingEnv methods, and matrix and table binding-index helpers.
Update IR guidance and tests
hail/hail/src/is/hail/expr/ir/add-ir-checklist.txt, hail/hail/test/src/is/hail/expr/ir/IRSuite.scala, hail/hail/test/src/is/hail/expr/ir/lowering/NestingDepthSuite.scala
Updates the checklist to direct node authors to ChildEnv and Binds. Removes the child-environment comparison test and updates a comment to refer to ChildEnv.get.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Refactor

Possibly related PRs

  • hail-is/hail#15919: Adds Binds and ChildEnv as replacements for Bindings.get.
  • hail-is/hail#15920: Changes IR child traversal to use ChildEnv and Scopes instead of Bindings.
  • hail-is/hail#15918: Introduces Scopes and the BindingEnv scope instance used by Binds and ChildEnv.

Suggested reviewers: patrick-schultz, chrisvittal

Merge Risk: Low · previous review 722f6

The cleanup is mergeable with a bounded test-coverage follow-up: retain focused checks for StreamZipJoinProducers child scopes. No current behavioral failure was established.

Pre-merge checks: Passed 3 · Failed 1

Failed Failed checks: 1 warning

Check name Status Explanation Resolution
Description check Warning The description explains the change, motivation, stack context, and affected components. It does not include the required Security Assessment, Impact Rating, Impact Description, or Appsec Review secti… Add the required Security Assessment section. State whether the change can impact the Hail Batch instance, provide the applicable Impact Rating and Impact Description, and include the required Appsec Review checkbox when applicable.
Passed Passed checks: 3 passed

Check name Status Explanation
Title check Passed The title clearly and concisely identifies the main change: removing Bindings, AggEnv, and GenericBindingEnv.
Linked Issues check Passed Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check Passed Check skipped because no linked issues were found for this pull request.
Full details: Description check

Explanation

The description explains the change, motivation, stack context, and affected components. It does not include the required Security Assessment, Impact Rating, Impact Description, or Appsec Review sections.

Resolution

Add the required Security Assessment section. State whether the change can impact the Hail Batch instance, provide the applicable Impact Rating and Impact Description, and include the required Appsec Review checkbox when applicable.

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Follow-up Comments

Nitpick Add a test that constructs StreamZipJoinProducers under an outer scope with eval, agg, and scan nam…

3973-3973: Trivial · Functional Correctness · Low value

Add a test that constructs StreamZipJoinProducers under an outer scope with eval, agg, and scan names.

This PR removes the only test that checked ChildEnv.get output for StreamZipJoinProducers under mixed eval, agg, and scan scopes. No test in hail/hail/test/src constructs this node now, so a wrong child scope for its children would not be caught by a test that names it. zipJoin2IR builds StreamZipJoin, not StreamZipJoinProducers, so it does not cover this node.

Add a case that builds StreamZipJoinProducers(contexts, ctxName, makeProducer, key, curKey, curVals, joinF) inside an outer binder that introduces eval, agg, and scan names. Check that each child sees the expected names. Other suites already exercise scope placement for AggFilter, aggFoldIR, ApplyScanOp, and aggElements, so this case covers only the lost node.

Open the source location

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Review comment at @hail/hail/test/src/is/hail/expr/ir/IRSuite.scala at line
3973:
Add a focused IRSuite test that constructs StreamZipJoinProducers inside an
outer binder introducing eval, agg, and scan names, then checks ChildEnv.get for
each child against the expected names. Keep the test limited to this node; do
not rely on zipJoin2IR, which exercises StreamZipJoin instead.

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Reviewing files that changed from the base of the PR and between 2072333 and 722f6ce.

Files selected for processing: 2
  • hail/hail/src/is/hail/expr/ir/Binds.scala
  • hail/hail/test/src/is/hail/expr/ir/IRSuite.scala

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@ehigham
ehigham removed this pull request from stack #15925 November 3, 2026 20:52
@ehigham
ehigham added this pull request to stack #15930 November 3, 2026 20:52
@hail-ci-robot
hail-ci-robot force-pushed the ehigham/scoping-7-delete branch from 722f6ce to a234c51 Compare November 4, 2026 21:42
hail-ci-robot pushed a commit that referenced this pull request Nov 5, 2026
Stack 2 of 7. Based on #15918.

## Why

Part of a stack that writes IR scoping once, as functions of the bound
values, so the
planned abstract interpretation driver can share it with every other
pass. #15918 has
the full motivation.

This PR adds the scoping functions and the code that picks one for a
given child. It is
a lot of code. Most nodes now appear three times, and `ChildEnv.scala`
plus `Binds.scala`
are about 1,190 lines, where the `Bindings` code they replace is about
390. A reviewer
could fairly call it hideous. Each layer is there because some callers
can't use the
layer above it.

```text
ChildEnv.get(e, ir, i)(v)                       layer 1: match on the node, one line each
  ChildEnv.streamMap(e, i, name, children)(v)   layer 2: pick child i, read types from
                                                  children(0 until i), make values with v
    Binds.streamMap(e, name, elt)               layer 3: the scoping rule
```

- **Layer 3, `Binds`.** Name fields and values in, env out. No node, no
types, no child
index. The abstract interpreter's driver will call this layer. Its
values come from the
  analysis, so it has no types or children to hand over. The parser and
  `PruneDeadFields`' per-node cases will call it too.
- **Layer 2, `ChildEnv.<node>`.** Reads types from a list of children,
not from the node,
and only from children before `i`. So a caller can use it before the
node exists. Two
later changes need that: a parser that types each node as it builds it,
and walkers
  that build each node once.
- **Layer 1, `ChildEnv.get`.** For generic passes that hold a built
node. It replaces
`Bindings.get`. At one line per node it is about 2.1 KB of bytecode,
under the
  8000-byte limit above which HotSpot won't JIT-compile a method.

`Bindings.get` did all three jobs in one function, so no caller could
reuse only the part
it needed.

The duplication is mechanical: a layer-2 function is a few lines that
read types and call
layer 3. A temporary test, `IRSuite.testChildEnvAgreesWithBindings`,
checks that the three
layers give the same env as `Bindings.get` for every child of every IR
in `IRSuite`. It
goes with `Bindings` in #15924.

## Summary

`Binds` has one rule per (node, child) whose env differs from its
parent's, written
against `Scopes`. `ChildEnv.get` picks the rule for a child.

```scala
ChildEnv.get[E[_]: Scopes, A](e: E[A], ir: BaseIR, i: Int)(v: (Name, Type) => A): E[A]
//   picks child i, reads types from the earlier children, calls the node's Binds rule;
//   v makes the value each name is bound to

Binds.streamMap[E[_]: Scopes, A](e: E[A], name: Name, elt: A): E[A] =
  e.bind(EVAL, FastSeq(name -> elt))
```

`main`'s `Binds.apply` had one caller, `Simplify`, which now asks
`ChildEnv`:

```diff
-Binds(ir1, name, idx)
+bindsEval(ir1, name, idx)   // ChildEnv.get(empty, ir1, idx)(...).eval.contains(name)
```

`Bindings.applyRecord` applies an old `Bindings` record through
`Scopes`, so a temporary
test can compare old and new.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
Nothing calls the old scoping code now that every caller uses ChildEnv.get.
This deletes Bindings, AggEnv, GenericBindingEnv and BindingEnv's extend,
subtract and bindRelational, plus BindingEnv and Env helpers that were
already unused on main, and the IndexedSeq[Int] binding helpers on the
TableType and MatrixType companions. It also deletes IRSuite's test that
checked ChildEnv against Bindings.get. The IR checklist now names ChildEnv
and Binds.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
@hail-ci-robot
hail-ci-robot force-pushed the ehigham/scoping-7-delete branch from a234c51 to 2b59958 Compare November 5, 2026 18:31

@chrisvittal chrisvittal left a comment

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