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ARROW-11313: [Rust] Fixed size_hint #9258

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ARROW-11313: [Rust] Fixed size_hint #9258

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jorgecarleitao
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size_hint should return the remaining items, not the total number of items.

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Codecov Report

Merging #9258 (f76ceab) into master (1393188) will increase coverage by 0.00%.
The diff coverage is 100.00%.

Impacted file tree graph

@@           Coverage Diff           @@
##           master    #9258   +/-   ##
=======================================
  Coverage   81.61%   81.61%           
=======================================
  Files         215      215           
  Lines       51867    51891   +24     
=======================================
+ Hits        42329    42353   +24     
  Misses       9538     9538           
Impacted Files Coverage Δ
rust/arrow/src/array/iterator.rs 93.45% <100.00%> (ø)
rust/parquet/src/arrow/schema.rs 91.66% <100.00%> (+0.16%) ⬆️
rust/arrow/src/array/transform/fixed_binary.rs 84.21% <0.00%> (+5.26%) ⬆️

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This looks consistent with https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.size_hint to me. 👍 @jorgecarleitao

I also found another implementation of size_hint but that seems to be doing the right thing: https://github.com/alamb/arrow/blob/master/rust/arrow/src/util/bit_chunk_iterator.rs#L156

@alamb alamb closed this in 8e218e0 Jan 19, 2021
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alamb commented Jan 19, 2021

I merged this branch locally and ran the tests and everything looked good 👍

kszucs pushed a commit that referenced this pull request Jan 25, 2021
`size_hint` should return the remaining items, not the total number of items.

Closes #9258 from jorgecarleitao/fix_size_hint

Authored-by: Jorge C. Leitao <jorgecarleitao@gmail.com>
Signed-off-by: Andrew Lamb <andrew@nerdnetworks.org>
GeorgeAp pushed a commit to sirensolutions/arrow that referenced this pull request Jun 7, 2021
`size_hint` should return the remaining items, not the total number of items.

Closes apache#9258 from jorgecarleitao/fix_size_hint

Authored-by: Jorge C. Leitao <jorgecarleitao@gmail.com>
Signed-off-by: Andrew Lamb <andrew@nerdnetworks.org>
michalursa pushed a commit to michalursa/arrow that referenced this pull request Jun 13, 2021
`size_hint` should return the remaining items, not the total number of items.

Closes apache#9258 from jorgecarleitao/fix_size_hint

Authored-by: Jorge C. Leitao <jorgecarleitao@gmail.com>
Signed-off-by: Andrew Lamb <andrew@nerdnetworks.org>
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4 participants