-
Notifications
You must be signed in to change notification settings - Fork 2.8k
/
SimplifyExpressions.java
81 lines (73 loc) · 3.72 KB
/
SimplifyExpressions.java
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
/*
* Licensed 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.
*/
package io.trino.sql.planner.iterative.rule;
import com.google.common.collect.ImmutableSet;
import io.trino.Session;
import io.trino.spi.type.Type;
import io.trino.sql.PlannerContext;
import io.trino.sql.planner.ExpressionInterpreter;
import io.trino.sql.planner.LiteralEncoder;
import io.trino.sql.planner.NoOpSymbolResolver;
import io.trino.sql.planner.SymbolAllocator;
import io.trino.sql.planner.TypeAnalyzer;
import io.trino.sql.planner.iterative.Rule;
import io.trino.sql.tree.Expression;
import io.trino.sql.tree.NodeRef;
import io.trino.sql.tree.SymbolReference;
import java.util.Map;
import java.util.Set;
import static io.trino.sql.planner.iterative.rule.ExtractCommonPredicatesExpressionRewriter.extractCommonPredicates;
import static io.trino.sql.planner.iterative.rule.NormalizeOrExpressionRewriter.normalizeOrExpression;
import static io.trino.sql.planner.iterative.rule.PushDownNegationsExpressionRewriter.pushDownNegations;
import static java.util.Objects.requireNonNull;
public class SimplifyExpressions
extends ExpressionRewriteRuleSet
{
public static Expression rewrite(Expression expression, Session session, SymbolAllocator symbolAllocator, PlannerContext plannerContext, TypeAnalyzer typeAnalyzer)
{
requireNonNull(plannerContext, "plannerContext is null");
requireNonNull(typeAnalyzer, "typeAnalyzer is null");
if (expression instanceof SymbolReference) {
return expression;
}
Map<NodeRef<Expression>, Type> expressionTypes = typeAnalyzer.getTypes(session, symbolAllocator.getTypes(), expression);
expression = pushDownNegations(plannerContext.getMetadata(), expression, expressionTypes);
expression = extractCommonPredicates(plannerContext.getMetadata(), expression);
expression = normalizeOrExpression(expression);
expressionTypes = typeAnalyzer.getTypes(session, symbolAllocator.getTypes(), expression);
ExpressionInterpreter interpreter = new ExpressionInterpreter(expression, plannerContext, session, expressionTypes);
Object optimized = interpreter.optimize(NoOpSymbolResolver.INSTANCE);
return new LiteralEncoder(plannerContext).toExpression(session, optimized, expressionTypes.get(NodeRef.of(expression)));
}
public SimplifyExpressions(PlannerContext plannerContext, TypeAnalyzer typeAnalyzer)
{
super(createRewrite(plannerContext, typeAnalyzer));
}
@Override
public Set<Rule<?>> rules()
{
return ImmutableSet.of(
projectExpressionRewrite(),
filterExpressionRewrite(),
joinExpressionRewrite(),
valuesExpressionRewrite(),
patternRecognitionExpressionRewrite()); // ApplyNode and AggregationNode are not supported, because ExpressionInterpreter doesn't support them
}
private static ExpressionRewriter createRewrite(PlannerContext plannerContext, TypeAnalyzer typeAnalyzer)
{
requireNonNull(plannerContext, "plannerContext is null");
requireNonNull(typeAnalyzer, "typeAnalyzer is null");
return (expression, context) -> rewrite(expression, context.getSession(), context.getSymbolAllocator(), plannerContext, typeAnalyzer);
}
}