tustvold opened a new issue #1724:
URL: https://github.com/apache/arrow-datafusion/issues/1724
**Is your feature request related to a problem or challenge? Please describe
what you are trying to do.**
Datafusion does not appear to eliminate FilterExec with constant filters.
```
> explain select * from system.chunks where false;
+---------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| plan_type | plan
|
+---------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| logical_plan | Projection: #system.chunks.id,
#system.chunks.partition_key, #system.chunks.table_name,
#system.chunks.storage, #system.chunks.lifecycle_action,
#system.chunks.memory_bytes, #system.chunks.object_store_bytes,
#system.chunks.row_count, #system.chunks.time_of_last_access,
#system.chunks.time_of_first_write, #system.chunks.time_of_last_write,
#system.chunks.order |
| | Filter: Boolean(false)
|
| | TableScan: system.chunks projection=Some([0, 1, 2, 3,
4, 5, 6, 7, 8, 9, 10, 11])
|
| physical_plan | ProjectionExec: expr=[id@0 as id, partition_key@1 as
partition_key, table_name@2 as table_name, storage@3 as storage,
lifecycle_action@4 as lifecycle_action, memory_bytes@5 as memory_bytes,
object_store_bytes@6 as object_store_bytes, row_count@7 as row_count,
time_of_last_access@8 as time_of_last_access, time_of_first_write@9 as
time_of_first_write, time_of_last_write@10 as time_of_last_write, order@11 as
order] |
| | CoalesceBatchesExec: target_batch_size=500
|
| | FilterExec: false
|
| | RepartitionExec: partitioning=RoundRobinBatch(28)
|
| | MemoryExec: partitions=1, partition_sizes=[1]
|
| |
|
+---------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
```
Whilst unlikely for a user to write such a query, this can occur when
constant propagation collapses a boolean expression to a constant.
**Describe the solution you'd like**
The logical plan should be optimized to remove `Filter: Boolean(true)`
whilst preserving its children, and to remove `Filter: Boolean(false)` and all
its children.
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