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[jOOQ/jOOQ#7997] Emulate DISTINCT predicate using DECODE in Oracle

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This commit is contained in:
Lukas Eder 2020-05-08 09:34:48 +02:00
parent cd346ec45a
commit fc3b9cdca1
1 changed files with 15 additions and 2 deletions
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17
jOOQ/src/main/java/org/jooq/impl/IsDistinctFrom.java
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@ -60,7 +60,9 @@ import static org.jooq.SQLDialect.SQLITE;
// ...
// ...
import static org.jooq.impl.DSL.condition;
import static org.jooq.impl.DSL.decode;
import static org.jooq.impl.DSL.exists;
import static org.jooq.impl.DSL.inline;
import static org.jooq.impl.DSL.notExists;
import static org.jooq.impl.DSL.row;
import static org.jooq.impl.DSL.select;
@ -72,6 +74,7 @@ import java.util.Set;
import org.jooq.Comparator;
import org.jooq.Context;
import org.jooq.Field;
// ...
import org.jooq.QueryPartInternal;
import org.jooq.SQLDialect;
@ -88,6 +91,10 @@ final class IsDistinctFrom<T> extends AbstractCondition {
private static final Set<SQLDialect> EMULATE_DISTINCT_PREDICATE = SQLDialect.supportedUntil(CUBRID, DERBY);
private static final Set<SQLDialect> SUPPORT_DISTINCT_WITH_ARROW = SQLDialect.supportedBy(MARIADB, MYSQL);
private final Field<T> lhs;
private final Field<T> rhs;
private final Comparator comparator;
@ -103,6 +110,13 @@ final class IsDistinctFrom<T> extends AbstractCondition {
if (isEmbeddable(lhs) && isEmbeddable(rhs))
ctx.visit(row(embeddedFields(lhs)).compare(comparator, row(embeddedFields(rhs))));
// [#3511] These dialects need to emulate the IS DISTINCT FROM predicate,
// optimally using INTERSECT...
// [#7222] [#7224] Make sure the columns are aliased
@ -112,11 +126,10 @@ final class IsDistinctFrom<T> extends AbstractCondition {
: (QueryPartInternal) exists(select(lhs.as("x")).intersect(select(rhs.as("x")))));
// MySQL knows the <=> operator
else if (SUPPORT_DISTINCT_WITH_ARROW.contains(ctx.dialect())) {
else if (SUPPORT_DISTINCT_WITH_ARROW.contains(ctx.dialect()))
ctx.visit(comparator == IS_DISTINCT_FROM
? condition("{not}({0} <=> {1})", lhs, rhs)
: condition("{0} <=> {1}", lhs, rhs));
}
// SQLite knows the IS / IS NOT predicate
else if (SQLITE == ctx.family())