vrozov commented on a change in pull request #1298: DRILL-5796: Filter pruning
for multi rowgroup parquet file
URL: https://github.com/apache/drill/pull/1298#discussion_r199868514
##########
File path:
exec/java-exec/src/main/java/org/apache/drill/exec/expr/stat/ParquetIsPredicate.java
##########
@@ -62,90 +60,89 @@ private ParquetIsPredicate(LogicalExpression expr,
BiPredicate<Statistics<C>, Ra
return visitor.visitUnknown(this, value);
}
- @Override
- public boolean canDrop(RangeExprEvaluator<C> evaluator) {
+ /**
+ * Apply the filter condition against the meta of the rowgroup.
+ */
+ public RowsMatch matches(RangeExprEvaluator<C> evaluator) {
Statistics<C> exprStat = expr.accept(evaluator, null);
- if (isNullOrEmpty(exprStat)) {
- return false;
- }
+ return ParquetPredicatesHelper.isNullOrEmpty(exprStat) ? RowsMatch.SOME :
predicate.apply(exprStat, evaluator);
+ }
- return predicate.test(exprStat, evaluator);
+ /**
+ * After the applying of the filter against the statistics of the rowgroup,
if the result is RowsMatch.ALL,
+ * then we still must know if the rowgroup contains some null values,
because it can change the filter result.
+ * If it contains some null values, then we change the RowsMatch.ALL into
RowsMatch.SOME, which sya that maybe
+ * some values (the null ones) should be disgarded.
+ */
+ static RowsMatch checkNull(Statistics exprStat) {
+ return exprStat.getNumNulls() > 0 ? RowsMatch.SOME : RowsMatch.ALL;
}
/**
* IS NULL predicate.
*/
private static <C extends Comparable<C>> LogicalExpression
createIsNullPredicate(LogicalExpression expr) {
return new ParquetIsPredicate<C>(expr,
- //if there are no nulls -> canDrop
- (exprStat, evaluator) -> hasNoNulls(exprStat)) {
- private final boolean isArray = isArray(expr);
-
- private boolean isArray(LogicalExpression expression) {
- if (expression instanceof TypedFieldExpr) {
- TypedFieldExpr typedFieldExpr = (TypedFieldExpr) expression;
- SchemaPath schemaPath = typedFieldExpr.getPath();
- return schemaPath.isArray();
- }
- return false;
- }
-
- @Override
- public boolean canDrop(RangeExprEvaluator<C> evaluator) {
+ (exprStat, evaluator) -> {
// for arrays we are not able to define exact number of nulls
// [1,2,3] vs [1,2] -> in second case 3 is absent and thus it's null
but statistics shows no nulls
- return !isArray && super.canDrop(evaluator);
- }
- };
+ TypedFieldExpr typedFieldExpr = (TypedFieldExpr) expr;
+ if (typedFieldExpr.getPath().isArray()) {
+ return RowsMatch.SOME;
+ }
+ if (hasNoNulls(exprStat)) {
+ return RowsMatch.NONE;
+ }
+ return isAllNulls(exprStat, evaluator.getRowCount()) ? RowsMatch.ALL :
RowsMatch.SOME;
+ });
}
/**
* IS NOT NULL predicate.
*/
private static <C extends Comparable<C>> LogicalExpression
createIsNotNullPredicate(LogicalExpression expr) {
return new ParquetIsPredicate<C>(expr,
- //if there are all nulls -> canDrop
- (exprStat, evaluator) -> isAllNulls(exprStat, evaluator.getRowCount())
+ (exprStat, evaluator) -> isAllNulls(exprStat, evaluator.getRowCount()) ?
RowsMatch.NONE : checkNull(exprStat)
);
}
/**
* IS TRUE predicate.
*/
- private static LogicalExpression createIsTruePredicate(LogicalExpression
expr) {
- return new ParquetIsPredicate<Boolean>(expr,
- //if max value is not true or if there are all nulls -> canDrop
- (exprStat, evaluator) -> !((BooleanStatistics)exprStat).getMax() ||
isAllNulls(exprStat, evaluator.getRowCount())
- );
+ private static <C extends Comparable<C>> LogicalExpression
createIsTruePredicate(LogicalExpression expr) {
+ return new ParquetIsPredicate<C>(expr,
+ (exprStat, evaluator) -> {
+ if (isAllNulls(exprStat, evaluator.getRowCount()) ||
(exprStat.genericGetMin().equals(Boolean.FALSE) &&
exprStat.genericGetMax().equals(Boolean.FALSE))) {
+ return RowsMatch.NONE;
+ }
+ return exprStat.genericGetMin().equals(Boolean.TRUE) &&
exprStat.genericGetMax().equals(Boolean.TRUE) ? checkNull(exprStat) :
RowsMatch.SOME;
+ });
}
/**
* IS FALSE predicate.
*/
- private static LogicalExpression createIsFalsePredicate(LogicalExpression
expr) {
- return new ParquetIsPredicate<Boolean>(expr,
- //if min value is not false or if there are all nulls -> canDrop
- (exprStat, evaluator) -> ((BooleanStatistics)exprStat).getMin() ||
isAllNulls(exprStat, evaluator.getRowCount())
+ private static <C extends Comparable<C>> LogicalExpression
createIsFalsePredicate(LogicalExpression expr) {
+ return new ParquetIsPredicate<C>(expr,
+ (exprStat, evaluator) -> !exprStat.genericGetMin().equals(Boolean.FALSE)
|| isAllNulls(exprStat, evaluator.getRowCount()) ? RowsMatch.NONE :
checkNull(exprStat)
);
}
/**
* IS NOT TRUE predicate.
*/
- private static LogicalExpression createIsNotTruePredicate(LogicalExpression
expr) {
- return new ParquetIsPredicate<Boolean>(expr,
- //if min value is not false or if there are no nulls -> canDrop
- (exprStat, evaluator) -> ((BooleanStatistics)exprStat).getMin() &&
hasNoNulls(exprStat)
+ private static <C extends Comparable<C>> LogicalExpression
createIsNotTruePredicate(LogicalExpression expr) {
+ return new ParquetIsPredicate<C>(expr,
+ (exprStat, evaluator) -> !exprStat.genericGetMin().equals(Boolean.FALSE)
&& hasNoNulls(exprStat) ? RowsMatch.NONE : checkNull(exprStat)
);
}
/**
* IS NOT FALSE predicate.
*/
- private static LogicalExpression createIsNotFalsePredicate(LogicalExpression
expr) {
- return new ParquetIsPredicate<Boolean>(expr,
- //if max value is not true or if there are no nulls -> canDrop
- (exprStat, evaluator) -> !((BooleanStatistics)exprStat).getMax() &&
hasNoNulls(exprStat)
+ private static <C extends Comparable<C>> LogicalExpression
createIsNotFalsePredicate(LogicalExpression expr) {
+ return new ParquetIsPredicate<C>(expr,
+ (exprStat, evaluator) -> !exprStat.genericGetMax().equals(Boolean.TRUE)
&& hasNoNulls(exprStat) ? RowsMatch.NONE : checkNull(exprStat)
Review comment:
"is true" can only be applied to a boolean expression and boolean expression
can only produce `BooleanStatistics`. It is invalid anyway to compare
`Integer`, `Long` or `Double` to `True` or `False`.
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