Remove offset if its zero

[turbo1912]

Which issue does this PR close?

Closes #2584

Rationale for this change

If offset is 0, it should be a no-op and can be optimized out.

Questions to the reviewer?
Current proposed change adds this optimization to an existing slightly related optimizer. Does this require its own optimizer independent from eliminate_limit?

[codecov-commenter]

Codecov Report

Merging #3102 (c2e0d18) into master (85d5363) will increase coverage by 0.01%.
The diff coverage is 94.53%.

❗ Current head c2e0d18 differs from pull request most recent head 67741f8. Consider uploading reports for the commit 67741f8 to get more accurate results

@@            Coverage Diff             @@
##           master    #3102      +/-   ##
==========================================
+ Coverage   85.93%   85.95%   +0.01%     
==========================================
  Files         289      290       +1     
  Lines       52101    52270     +169     
==========================================
+ Hits        44774    44927     +153     
- Misses       7327     7343      +16     

Impacted Files	Coverage Δ
...usion/core/src/avro_to_arrow/arrow_array_reader.rs	0.00% <0.00%> (ø)
datafusion/core/src/catalog/information_schema.rs	94.42% <0.00%> (ø)
datafusion/core/src/datasource/listing/mod.rs	55.55% <ø> (ø)
...afusion/core/src/physical_plan/file_format/avro.rs	0.00% <ø> (ø)
datafusion/core/src/physical_plan/hash_utils.rs	40.43% <0.00%> (ø)
datafusion/core/src/physical_plan/repartition.rs	93.26% <ø> (ø)
...tafusion/core/src/physical_plan/sort_merge_join.rs	90.36% <0.00%> (ø)
datafusion/core/tests/sql/aggregates.rs	99.36% <ø> (ø)
datafusion/core/tests/sql/decimal.rs	100.00% <ø> (ø)
datafusion/core/tests/sql/joins.rs	99.33% <ø> (ø)
... and 51 more

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more

[andygrove]

LGTM @turbo1912. Could you update the rustdoc at the top of the file now that this optimizes both limits and offsets? I think it makes sense for these related optimizations to be in the same rule.

[alamb]

Nice -- thanks @turbo1912 !

[ursabot]

Benchmark runs are scheduled for baseline = 9956f80 and contender = dbfb0e6. dbfb0e6 is a master commit associated with this PR. Results will be available as each benchmark for each run completes.
Conbench compare runs links:
[Skipped ⚠️ Benchmarking of arrow-datafusion-commits is not supported on ec2-t3-xlarge-us-east-2] ec2-t3-xlarge-us-east-2
[Skipped ⚠️ Benchmarking of arrow-datafusion-commits is not supported on test-mac-arm] test-mac-arm
[Skipped ⚠️ Benchmarking of arrow-datafusion-commits is not supported on ursa-i9-9960x] ursa-i9-9960x
[Skipped ⚠️ Benchmarking of arrow-datafusion-commits is not supported on ursa-thinkcentre-m75q] ursa-thinkcentre-m75q
Buildkite builds:
Supported benchmarks:
ec2-t3-xlarge-us-east-2: Supported benchmark langs: Python, R. Runs only benchmarks with cloud = True
test-mac-arm: Supported benchmark langs: C++, Python, R
ursa-i9-9960x: Supported benchmark langs: Python, R, JavaScript
ursa-thinkcentre-m75q: Supported benchmark langs: C++, Java