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[opt](Nereids) add where Null rule to create empty relation as where false (#38135) (#38361)

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pick from master #38135 

explain shape plan select * from table2 where Null; explain shape plan
select * from table2 where false; in this case, null literal can be
regard as same as false literal
This commit is contained in:
LiBinfeng
2024-07-26 14:50:06 +08:00
committed by GitHub
parent df96db3f96
commit 2f6b2dbdc4
5 changed files with 187 additions and 23 deletions
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8
fe/fe-core/src/main/java/org/apache/doris/nereids/rules/rewrite/EliminateFilter.java
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@ -24,6 +24,7 @@ import org.apache.doris.nereids.rules.expression.rules.FoldConstantRule;
import org.apache.doris.nereids.trees.expressions.Expression;
import org.apache.doris.nereids.trees.expressions.Slot;
import org.apache.doris.nereids.trees.expressions.literal.BooleanLiteral;
import org.apache.doris.nereids.trees.expressions.literal.NullLiteral;
import org.apache.doris.nereids.trees.plans.Plan;
import org.apache.doris.nereids.trees.plans.logical.LogicalEmptyRelation;
import org.apache.doris.nereids.trees.plans.logical.LogicalFilter;
@ -43,12 +44,13 @@ public class EliminateFilter implements RewriteRuleFactory {
@Override
public List<Rule> buildRules() {
return ImmutableList.of(logicalFilter().when(
filter -> ExpressionUtils.containsType(filter.getConjuncts(), BooleanLiteral.class))
filter -> ExpressionUtils.containsType(filter.getConjuncts(), BooleanLiteral.class)
|| ExpressionUtils.containsType(filter.getConjuncts(), NullLiteral.class))
.thenApply(ctx -> {
LogicalFilter<Plan> filter = ctx.root;
ImmutableSet.Builder<Expression> newConjuncts = ImmutableSet.builder();
for (Expression expression : filter.getConjuncts()) {
if (expression == BooleanLiteral.FALSE) {
if (expression == BooleanLiteral.FALSE || expression.isNullLiteral()) {
return new LogicalEmptyRelation(ctx.statementContext.getNextRelationId(),
filter.getOutput());
} else if (expression != BooleanLiteral.TRUE) {
@ -75,7 +77,7 @@ public class EliminateFilter implements RewriteRuleFactory {
Expression newExpr = ExpressionUtils.replace(expression, replaceMap);
Expression foldExpression = FoldConstantRule.evaluate(newExpr, context);
if (foldExpression == BooleanLiteral.FALSE) {
if (foldExpression == BooleanLiteral.FALSE || expression.isNullLiteral()) {
return new LogicalEmptyRelation(
ctx.statementContext.getNextRelationId(), filter.getOutput());
} else if (foldExpression != BooleanLiteral.TRUE) {