Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/1981#discussion_r63255457
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/api/table/table.scala
---
@@ -334,6 +335,156 @@ class Table(
* }}}
*/
def join(right: Table): Table = {
+ join(right, new Literal(true, TypeInformation.of(classOf[Boolean])),
JoinType.INNER)
+ }
+
+ /**
+ * Joins two [[Table]]s. Similar to an SQL join. The fields of the two
joined
+ * operations must not overlap, use [[as]] to rename fields if
necessary.
+ *
+ * Note: Both tables must be bound to the same [[TableEnvironment]].
+ *
+ * Example:
+ *
+ * {{{
+ * left.join(right, "a = b && c > 3")
+ * }}}
+ */
+ def join(right: Table, joinPredicate: String): Table = {
+ join(right, joinPredicate, JoinType.INNER)
+ }
+
+ /**
+ * Joins two [[Table]]s. Similar to an SQL join. The fields of the two
joined
+ * operations must not overlap, use [[as]] to rename fields if
necessary.
+ *
+ * Note: Both tables must be bound to the same [[TableEnvironment]].
+ *
+ * Example:
+ *
+ * {{{
+ * left.join(right, 'a === 'b && 'c > 3).select('a, 'b, 'd)
+ * }}}
+ */
+ def join(right: Table, joinPredicate: Expression): Table = {
+ join(right, joinPredicate, JoinType.INNER)
+ }
+
+ /**
+ * Joins two [[Table]]s. Similar to an SQL left outer join. The fields
of the two joined
+ * operations must not overlap, use [[as]] to rename fields if
necessary.
+ *
+ * Note: Both tables must be bound to the same [[TableEnvironment]] and
its [[TableConfig]] must
+ * have nullCheck enables.
+ *
+ * Example:
+ *
+ * {{{
+ * left.leftOuterJoin(right, "a = b && c > 3").select('a, 'b, 'd)
+ * }}}
+ */
+ def leftOuterJoin(right: Table, joinPredicate: String): Table = {
+ join(right, joinPredicate, JoinType.LEFT_OUTER)
+ }
+
+ /**
+ * Joins two [[Table]]s. Similar to an SQL left outer join. The fields
of the two joined
+ * operations must not overlap, use [[as]] to rename fields if
necessary.
+ *
+ * Note: Both tables must be bound to the same [[TableEnvironment]] and
its [[TableConfig]] must
+ * have nullCheck enables.
+ *
+ * Example:
+ *
+ * {{{
+ * left.leftOuterJoin(right, 'a === 'b && 'c > 3).select('a, 'b, 'd)
+ * }}}
+ */
+ def leftOuterJoin(right: Table, joinPredicate: Expression): Table = {
+ join(right, joinPredicate, JoinType.LEFT_OUTER)
+ }
+
+ /**
+ * Joins two [[Table]]s. Similar to an SQL right outer join. The fields
of the two joined
+ * operations must not overlap, use [[as]] to rename fields if
necessary.
+ *
+ * Note: Both tables must be bound to the same [[TableEnvironment]] and
its [[TableConfig]] must
+ * have nullCheck enables.
+ *
+ * Example:
+ *
+ * {{{
+ * left.rightOuterJoin(right, "a = b && c > 3").select('a, 'b, 'd)
+ * }}}
+ */
+ def rightOuterJoin(right: Table, joinPredicate: String): Table = {
+ join(right, joinPredicate, JoinType.RIGHT_OUTER)
+ }
+
+ /**
+ * Joins two [[Table]]s. Similar to an SQL right outer join. The fields
of the two joined
+ * operations must not overlap, use [[as]] to rename fields if
necessary.
+ *
+ * Note: Both tables must be bound to the same [[TableEnvironment]] and
its [[TableConfig]] must
+ * have nullCheck enables.
+ *
+ * Example:
+ *
+ * {{{
+ * left.rightOuterJoin(right, 'a === 'b && 'c > 3).select('a, 'b, 'd)
+ * }}}
+ */
+ def rightOuterJoin(right: Table, joinPredicate: Expression): Table = {
+ join(right, joinPredicate, JoinType.RIGHT_OUTER)
+ }
+
+ /**
+ * Joins two [[Table]]s. Similar to an SQL full outer join. The fields
of the two joined
+ * operations must not overlap, use [[as]] to rename fields if
necessary.
+ *
+ * Note: Both tables must be bound to the same [[TableEnvironment]] and
its [[TableConfig]] must
+ * have nullCheck enables.
+ *
+ * Example:
+ *
+ * {{{
+ * left.fullOuterJoin(right, "a = b && c > 3").select('a, 'b, 'd)
+ * }}}
+ */
+ def fullOuterJoin(right: Table, joinPredicate: String): Table = {
+ join(right, joinPredicate, JoinType.FULL_OUTER)
+ }
+
+ /**
+ * Joins two [[Table]]s. Similar to an SQL full outer join. The fields
of the two joined
+ * operations must not overlap, use [[as]] to rename fields if
necessary.
+ *
+ * Note: Both tables must be bound to the same [[TableEnvironment]] and
its [[TableConfig]] must
+ * have nullCheck enables.
+ *
+ * Example:
+ *
+ * {{{
+ * left.fullOuterJoin(right, 'a === 'b && 'c > 3).select('a, 'b, 'd)
+ * }}}
+ */
+ def fullOuterJoin(right: Table, joinPredicate: Expression): Table = {
+ join(right, joinPredicate, JoinType.FULL_OUTER)
+ }
+
+ private def flinkJoinTypeToCalcite(joinType: JoinType) = joinType match {
--- End diff --
I think you can also directly use Calcite's `JoinRelType` instead of
Flink's `JoinType`.
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