Fix warnings in database::abstraction
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@ -23,12 +23,12 @@ pub trait DatabaseEngine: Send + Sync {
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where
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Self: Sized;
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fn open_tree(&self, name: &'static str) -> Result<Arc<dyn Tree>>;
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fn flush(self: &Self) -> Result<()>;
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fn cleanup(self: &Self) -> Result<()> {
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fn flush(&self) -> Result<()>;
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fn cleanup(&self) -> Result<()> {
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Ok(())
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}
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fn memory_usage(self: &Self) -> Result<String> {
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Ok("Current database engine does not support memory usage reporting.".to_string())
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fn memory_usage(&self) -> Result<String> {
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Ok("Current database engine does not support memory usage reporting.".to_owned())
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}
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}
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