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btree/balance: add comment
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@@ -2464,6 +2464,7 @@ impl BTreeCursor {
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(WriteState::BalanceNonRootDoBalancing, Ok(CursorResult::IO))
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}
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WriteState::BalanceNonRootDoBalancing => {
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// Ensure all involved pages are in memory.
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let write_info = self.state.write_info().unwrap();
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let mut balance_info = write_info.balance_info.borrow_mut();
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let balance_info = balance_info.as_mut().unwrap();
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@@ -2475,7 +2476,7 @@ impl BTreeCursor {
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let page = page.as_ref().unwrap();
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return_if_locked_maybe_load!(self.pager, page);
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}
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// Now do real balancing
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// Start balancing.
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let parent_page_btree = self.stack.top();
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let parent_page = parent_page_btree.get();
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