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Commenting arcane trick in column deletion. #399

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Mar 3, 2021
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Commenting arcane trick in column deletion. #399

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5 changes: 5 additions & 0 deletions src/MOI_wrapper.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -401,6 +401,11 @@ function _update_if_necessary(model::Optimizer)
if model.needs_update
sort!(model.columns_deleted_since_last_update)
for var_info in values(model.variable_info)
# The trick here is: searchsortedlast returns, in O(log n), the
# last index with a column smaller than var_info.column, over
# columns_deleted_since_last_update this is the same as the number
# of columns deleted before it, and how much its value need to be
# shifted.
var_info.column -= searchsortedlast(
model.columns_deleted_since_last_update, var_info.column
)
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