marvinlanhenke commented on code in PR #347: URL: https://github.com/apache/iceberg-rust/pull/347#discussion_r1590269281
########## crates/iceberg/src/expr/visitors/inclusive_metrics_evaluator.rs: ########## @@ -0,0 +1,2255 @@ +// Licensed to the Apache Software Foundation (ASF) under one +// or more contributor license agreements. See the NOTICE file +// distributed with this work for additional information +// regarding copyright ownership. The ASF licenses this file +// to you under the Apache License, Version 2.0 (the +// "License"); you may not use this file except in compliance +// with the License. You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, +// software distributed under the License is distributed on an +// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY +// KIND, either express or implied. See the License for the +// specific language governing permissions and limitations +// under the License. + +use crate::expr::visitors::bound_predicate_visitor::{visit, BoundPredicateVisitor}; +use crate::expr::{BoundPredicate, BoundReference}; +use crate::spec::{DataFile, Datum, Literal, PrimitiveLiteral}; +use crate::{Error, ErrorKind}; +use fnv::FnvHashSet; + +const IN_PREDICATE_LIMIT: usize = 200; +const ROWS_MIGHT_MATCH: crate::Result<bool> = Ok(true); +const ROWS_CANNOT_MATCH: crate::Result<bool> = Ok(false); + +pub(crate) struct InclusiveMetricsEvaluator<'a> { + data_file: &'a DataFile, +} + +impl<'a> InclusiveMetricsEvaluator<'a> { + fn new(data_file: &'a DataFile) -> Self { + InclusiveMetricsEvaluator { data_file } + } + + /// Evaluate this `InclusiveMetricsEvaluator`'s filter predicate against the + /// provided [`DataFile`]'s metrics. Used by [`TableScan`] to + /// see if this `DataFile` contains data that could match + /// the scan's filter. + pub(crate) fn eval( + filter: &'a BoundPredicate, + data_file: &'a DataFile, + include_empty_files: bool, + ) -> crate::Result<bool> { + if !include_empty_files && data_file.record_count == 0 { + return ROWS_CANNOT_MATCH; + } + + let mut evaluator = Self::new(data_file); + visit(&mut evaluator, filter) + } + + fn nan_count(&self, field_id: i32) -> Option<&u64> { + self.data_file.nan_value_counts.get(&field_id) + } + + fn null_count(&self, field_id: i32) -> Option<&u64> { + self.data_file.null_value_counts.get(&field_id) + } + + fn value_count(&self, field_id: i32) -> Option<&u64> { + self.data_file.value_counts.get(&field_id) + } + + fn lower_bound(&self, field_id: i32) -> Option<&Literal> { + self.data_file.lower_bounds.get(&field_id) + } + + fn upper_bound(&self, field_id: i32) -> Option<&Literal> { + self.data_file.upper_bounds.get(&field_id) + } + + fn contains_nans_only(&self, field_id: i32) -> bool { + let nan_count = self.nan_count(field_id); + let value_count = self.value_count(field_id); + + nan_count.is_some() && nan_count == value_count + } + + fn contains_nulls_only(&self, field_id: i32) -> bool { + let null_count = self.null_count(field_id); + let value_count = self.value_count(field_id); + + null_count.is_some() && null_count == value_count + } + + fn may_contain_null(&self, field_id: i32) -> bool { + if let Some(&null_count) = self.null_count(field_id) { + null_count > 0 + } else { + true + } + } + + fn visit_inequality( + &mut self, + reference: &BoundReference, + datum: &Datum, + cmp_fn: fn(&PrimitiveLiteral, &PrimitiveLiteral) -> bool, + use_lower_bound: bool, + ) -> crate::Result<bool> { + let field_id = reference.field().id; + + if self.contains_nulls_only(field_id) || self.contains_nans_only(field_id) { + return ROWS_CANNOT_MATCH; + } + + if datum.is_nan() { + // NaN indicates unreliable bounds. + // See the InclusiveMetricsEvaluator docs for more. + return ROWS_MIGHT_MATCH; + } + + let bound = if use_lower_bound { + self.lower_bound(field_id) + } else { + self.upper_bound(field_id) + }; + + if let Some(bound) = bound { + let Literal::Primitive(bound) = bound else { + return Err(Error::new( + ErrorKind::Unexpected, + "Inequality Predicates can only compare against a Primitive Literal", + )); + }; + + if cmp_fn(bound, datum.literal()) { + return ROWS_MIGHT_MATCH; + } + + return ROWS_CANNOT_MATCH; + } + + ROWS_MIGHT_MATCH + } +} + +impl BoundPredicateVisitor for InclusiveMetricsEvaluator<'_> { + type T = bool; + + fn always_true(&mut self) -> crate::Result<bool> { + ROWS_MIGHT_MATCH + } + + fn always_false(&mut self) -> crate::Result<bool> { + ROWS_CANNOT_MATCH + } + + fn and(&mut self, lhs: bool, rhs: bool) -> crate::Result<bool> { + Ok(lhs && rhs) + } + + fn or(&mut self, lhs: bool, rhs: bool) -> crate::Result<bool> { + Ok(lhs || rhs) + } + + fn not(&mut self, inner: bool) -> crate::Result<bool> { + Ok(!inner) Review Comment: alright, understood. once we have all three evaluators merged we should perhaps agree on a way to handle this, i think the manifest_evaluator panics and the expression_evaluator returns an Err... -- This is an automated message from the Apache Git Service. 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