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体验新版 GitCode,发现更多精彩内容 >>
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提交
a859e2cc
编写于
12月 27, 2020
作者:
S
Shengkai
提交者:
GitHub
12月 27, 2020
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电子邮件补丁
差异文件
[FLINK-19650][jdbc][table] Support limit push down for the JDBC connector
This closes #13800
上级
a25b9b84
变更
13
展开全部
隐藏空白更改
内联
并排
Showing
13 changed file
with
912 addition
and
24 deletion
+912
-24
flink-connectors/flink-connector-jdbc/src/main/java/org/apache/flink/connector/jdbc/dialect/DerbyDialect.java
...org/apache/flink/connector/jdbc/dialect/DerbyDialect.java
+5
-0
flink-connectors/flink-connector-jdbc/src/main/java/org/apache/flink/connector/jdbc/dialect/JdbcDialect.java
.../org/apache/flink/connector/jdbc/dialect/JdbcDialect.java
+7
-0
flink-connectors/flink-connector-jdbc/src/main/java/org/apache/flink/connector/jdbc/dialect/MySQLDialect.java
...org/apache/flink/connector/jdbc/dialect/MySQLDialect.java
+5
-0
flink-connectors/flink-connector-jdbc/src/main/java/org/apache/flink/connector/jdbc/dialect/PostgresDialect.java
.../apache/flink/connector/jdbc/dialect/PostgresDialect.java
+5
-0
flink-connectors/flink-connector-jdbc/src/main/java/org/apache/flink/connector/jdbc/table/JdbcDynamicTableSource.java
...he/flink/connector/jdbc/table/JdbcDynamicTableSource.java
+19
-4
flink-connectors/flink-connector-jdbc/src/test/java/org/apache/flink/connector/jdbc/table/JdbcDynamicTableSourceITCase.java
...nk/connector/jdbc/table/JdbcDynamicTableSourceITCase.java
+49
-14
flink-connectors/flink-connector-jdbc/src/test/java/org/apache/flink/connector/jdbc/table/JdbcTablePlanTest.java
.../apache/flink/connector/jdbc/table/JdbcTablePlanTest.java
+11
-2
flink-connectors/flink-connector-jdbc/src/test/resources/org/apache/flink/connector/jdbc/table/JdbcTablePlanTest.xml
...g/apache/flink/connector/jdbc/table/JdbcTablePlanTest.xml
+19
-0
flink-table/flink-table-planner-blink/src/main/scala/org/apache/flink/table/planner/plan/rules/FlinkStreamRuleSets.scala
.../flink/table/planner/plan/rules/FlinkStreamRuleSets.scala
+1
-0
flink-table/flink-table-planner-blink/src/test/resources/org/apache/flink/table/planner/plan/stream/sql/LimitableSourceTest.xml
...ink/table/planner/plan/stream/sql/LimitableSourceTest.xml
+641
-0
flink-table/flink-table-planner-blink/src/test/scala/org/apache/flink/table/planner/plan/stream/sql/LimitTest.scala
...pache/flink/table/planner/plan/stream/sql/LimitTest.scala
+8
-4
flink-table/flink-table-planner-blink/src/test/scala/org/apache/flink/table/planner/plan/stream/sql/LimitableSourceTest.scala
...k/table/planner/plan/stream/sql/LimitableSourceTest.scala
+47
-0
flink-table/flink-table-planner-blink/src/test/scala/org/apache/flink/table/planner/runtime/stream/sql/LimitableSourceITCase.scala
...le/planner/runtime/stream/sql/LimitableSourceITCase.scala
+95
-0
未找到文件。
flink-connectors/flink-connector-jdbc/src/main/java/org/apache/flink/connector/jdbc/dialect/DerbyDialect.java
浏览文件 @
a859e2cc
...
...
@@ -66,6 +66,11 @@ class DerbyDialect extends AbstractDialect {
return
"Derby"
;
}
@Override
public
String
getLimitClause
(
long
limit
)
{
return
String
.
format
(
"FETCH FIRST %d ROWS ONLY"
,
limit
);
}
@Override
public
int
maxDecimalPrecision
()
{
return
MAX_DECIMAL_PRECISION
;
...
...
flink-connectors/flink-connector-jdbc/src/main/java/org/apache/flink/connector/jdbc/dialect/JdbcDialect.java
浏览文件 @
a859e2cc
...
...
@@ -57,6 +57,13 @@ public interface JdbcDialect extends Serializable {
*/
JdbcRowConverter
getRowConverter
(
RowType
rowType
);
/**
* Get limit clause to limit the number of emitted row from the jdbc source.
* @param limit number of row to emit. The value of the parameter should be non-negative.
* @return the limit clause.
*/
String
getLimitClause
(
long
limit
);
/**
* Check if this dialect instance support a specific data type in table schema.
* @param schema the table schema.
...
...
flink-connectors/flink-connector-jdbc/src/main/java/org/apache/flink/connector/jdbc/dialect/MySQLDialect.java
浏览文件 @
a859e2cc
...
...
@@ -55,6 +55,11 @@ public class MySQLDialect extends AbstractDialect {
return
new
MySQLRowConverter
(
rowType
);
}
@Override
public
String
getLimitClause
(
long
limit
)
{
return
"LIMIT "
+
limit
;
}
@Override
public
Optional
<
String
>
defaultDriverName
()
{
return
Optional
.
of
(
"com.mysql.jdbc.Driver"
);
...
...
flink-connectors/flink-connector-jdbc/src/main/java/org/apache/flink/connector/jdbc/dialect/PostgresDialect.java
浏览文件 @
a859e2cc
...
...
@@ -55,6 +55,11 @@ public class PostgresDialect extends AbstractDialect {
return
new
PostgresRowConverter
(
rowType
);
}
@Override
public
String
getLimitClause
(
long
limit
)
{
return
"LIMIT "
+
limit
;
}
@Override
public
Optional
<
String
>
defaultDriverName
()
{
return
Optional
.
of
(
"org.postgresql.Driver"
);
...
...
flink-connectors/flink-connector-jdbc/src/main/java/org/apache/flink/connector/jdbc/table/JdbcDynamicTableSource.java
浏览文件 @
a859e2cc
...
...
@@ -31,6 +31,7 @@ import org.apache.flink.table.connector.source.InputFormatProvider;
import
org.apache.flink.table.connector.source.LookupTableSource
;
import
org.apache.flink.table.connector.source.ScanTableSource
;
import
org.apache.flink.table.connector.source.TableFunctionProvider
;
import
org.apache.flink.table.connector.source.abilities.SupportsLimitPushDown
;
import
org.apache.flink.table.connector.source.abilities.SupportsProjectionPushDown
;
import
org.apache.flink.table.types.logical.RowType
;
import
org.apache.flink.table.utils.TableSchemaUtils
;
...
...
@@ -42,13 +43,18 @@ import java.util.Objects;
* A {@link DynamicTableSource} for JDBC.
*/
@Internal
public
class
JdbcDynamicTableSource
implements
ScanTableSource
,
LookupTableSource
,
SupportsProjectionPushDown
{
public
class
JdbcDynamicTableSource
implements
ScanTableSource
,
LookupTableSource
,
SupportsProjectionPushDown
,
SupportsLimitPushDown
{
private
final
JdbcOptions
options
;
private
final
JdbcReadOptions
readOptions
;
private
final
JdbcLookupOptions
lookupOptions
;
private
TableSchema
physicalSchema
;
private
final
String
dialectName
;
private
long
limit
=
-
1
;
public
JdbcDynamicTableSource
(
JdbcOptions
options
,
...
...
@@ -97,7 +103,7 @@ public class JdbcDynamicTableSource implements ScanTableSource, LookupTableSourc
}
final
JdbcDialect
dialect
=
options
.
getDialect
();
String
query
=
dialect
.
getSelectFromStatement
(
options
.
getTableName
(),
physicalSchema
.
getFieldNames
(),
new
String
[
0
]);
options
.
getTableName
(),
physicalSchema
.
getFieldNames
(),
new
String
[
0
]);
if
(
readOptions
.
getPartitionColumnName
().
isPresent
())
{
long
lowerBound
=
readOptions
.
getPartitionLowerBound
().
get
();
long
upperBound
=
readOptions
.
getPartitionUpperBound
().
get
();
...
...
@@ -108,6 +114,9 @@ public class JdbcDynamicTableSource implements ScanTableSource, LookupTableSourc
dialect
.
quoteIdentifier
(
readOptions
.
getPartitionColumnName
().
get
())
+
" BETWEEN ? AND ?"
;
}
if
(
limit
>=
0
)
{
query
=
String
.
format
(
"%s %s"
,
query
,
dialect
.
getLimitClause
(
limit
));
}
builder
.
setQuery
(
query
);
final
RowType
rowType
=
(
RowType
)
physicalSchema
.
toRowDataType
().
getLogicalType
();
builder
.
setRowConverter
(
dialect
.
getRowConverter
(
rowType
));
...
...
@@ -156,11 +165,17 @@ public class JdbcDynamicTableSource implements ScanTableSource, LookupTableSourc
Objects
.
equals
(
readOptions
,
that
.
readOptions
)
&&
Objects
.
equals
(
lookupOptions
,
that
.
lookupOptions
)
&&
Objects
.
equals
(
physicalSchema
,
that
.
physicalSchema
)
&&
Objects
.
equals
(
dialectName
,
that
.
dialectName
);
Objects
.
equals
(
dialectName
,
that
.
dialectName
)
&&
Objects
.
equals
(
limit
,
that
.
limit
);
}
@Override
public
int
hashCode
()
{
return
Objects
.
hash
(
options
,
readOptions
,
lookupOptions
,
physicalSchema
,
dialectName
);
return
Objects
.
hash
(
options
,
readOptions
,
lookupOptions
,
physicalSchema
,
dialectName
,
limit
);
}
@Override
public
void
applyLimit
(
long
limit
)
{
this
.
limit
=
limit
;
}
}
flink-connectors/flink-connector-jdbc/src/test/java/org/apache/flink/connector/jdbc/table/JdbcDynamicTableSourceITCase.java
浏览文件 @
a859e2cc
...
...
@@ -21,6 +21,7 @@ package org.apache.flink.connector.jdbc.table;
import
org.apache.flink.connector.jdbc.JdbcTestBase
;
import
org.apache.flink.streaming.api.environment.StreamExecutionEnvironment
;
import
org.apache.flink.table.api.EnvironmentSettings
;
import
org.apache.flink.table.api.TableEnvironment
;
import
org.apache.flink.table.api.bridge.java.StreamTableEnvironment
;
import
org.apache.flink.table.planner.runtime.utils.StreamTestSink
;
import
org.apache.flink.test.util.AbstractTestBase
;
...
...
@@ -35,12 +36,15 @@ import java.sql.Connection;
import
java.sql.DriverManager
;
import
java.sql.SQLException
;
import
java.sql.Statement
;
import
java.util.HashSet
;
import
java.util.Iterator
;
import
java.util.List
;
import
java.util.Set
;
import
java.util.stream.Collectors
;
import
java.util.stream.Stream
;
import
static
org
.
junit
.
Assert
.
assertEquals
;
import
static
org
.
junit
.
Assert
.
assertTrue
;
/**
* ITCase for {@link JdbcDynamicTableSource}.
...
...
@@ -51,8 +55,18 @@ public class JdbcDynamicTableSourceITCase extends AbstractTestBase {
public
static
final
String
DB_URL
=
"jdbc:derby:memory:test"
;
public
static
final
String
INPUT_TABLE
=
"jdbDynamicTableSource"
;
public
static
StreamExecutionEnvironment
env
;
public
static
TableEnvironment
tEnv
;
@Before
public
void
before
()
throws
ClassNotFoundException
,
SQLException
{
env
=
StreamExecutionEnvironment
.
getExecutionEnvironment
();
EnvironmentSettings
envSettings
=
EnvironmentSettings
.
newInstance
()
.
useBlinkPlanner
()
.
inStreamingMode
()
.
build
();
tEnv
=
StreamTableEnvironment
.
create
(
env
,
envSettings
);
System
.
setProperty
(
"derby.stream.error.field"
,
JdbcTestBase
.
class
.
getCanonicalName
()
+
".DEV_NULL"
);
Class
.
forName
(
DRIVER_CLASS
);
...
...
@@ -89,13 +103,6 @@ public class JdbcDynamicTableSourceITCase extends AbstractTestBase {
@Test
public
void
testJdbcSource
()
throws
Exception
{
StreamExecutionEnvironment
env
=
StreamExecutionEnvironment
.
getExecutionEnvironment
();
EnvironmentSettings
envSettings
=
EnvironmentSettings
.
newInstance
()
.
useBlinkPlanner
()
.
inStreamingMode
()
.
build
();
StreamTableEnvironment
tEnv
=
StreamTableEnvironment
.
create
(
env
,
envSettings
);
tEnv
.
executeSql
(
"CREATE TABLE "
+
INPUT_TABLE
+
"("
+
"id BIGINT,"
+
...
...
@@ -127,13 +134,6 @@ public class JdbcDynamicTableSourceITCase extends AbstractTestBase {
@Test
public
void
testProject
()
throws
Exception
{
StreamExecutionEnvironment
env
=
StreamExecutionEnvironment
.
getExecutionEnvironment
();
EnvironmentSettings
envSettings
=
EnvironmentSettings
.
newInstance
()
.
useBlinkPlanner
()
.
inStreamingMode
()
.
build
();
StreamTableEnvironment
tEnv
=
StreamTableEnvironment
.
create
(
env
,
envSettings
);
tEnv
.
executeSql
(
"CREATE TABLE "
+
INPUT_TABLE
+
"("
+
"id BIGINT,"
+
...
...
@@ -166,4 +166,39 @@ public class JdbcDynamicTableSourceITCase extends AbstractTestBase {
.
sorted
().
collect
(
Collectors
.
toList
());
assertEquals
(
expected
,
result
);
}
@Test
public
void
testLimit
()
throws
Exception
{
tEnv
.
executeSql
(
"CREATE TABLE "
+
INPUT_TABLE
+
"(\n"
+
"id BIGINT,\n"
+
"timestamp6_col TIMESTAMP(6),\n"
+
"timestamp9_col TIMESTAMP(9),\n"
+
"time_col TIME,\n"
+
"real_col FLOAT,\n"
+
"double_col DOUBLE,\n"
+
"decimal_col DECIMAL(10, 4)\n"
+
") WITH (\n"
+
" 'connector'='jdbc',\n"
+
" 'url'='"
+
DB_URL
+
"',\n"
+
" 'table-name'='"
+
INPUT_TABLE
+
"',\n"
+
" 'scan.partition.column'='id',\n"
+
" 'scan.partition.num'='2',\n"
+
" 'scan.partition.lower-bound'='1',\n"
+
" 'scan.partition.upper-bound'='2'\n"
+
")"
);
Iterator
<
Row
>
collected
=
tEnv
.
executeSql
(
"SELECT * FROM "
+
INPUT_TABLE
+
" LIMIT 1"
).
collect
();
List
<
String
>
result
=
CollectionUtil
.
iteratorToList
(
collected
).
stream
()
.
map
(
Row:
:
toString
)
.
sorted
()
.
collect
(
Collectors
.
toList
());
Set
<
String
>
expected
=
new
HashSet
<>();
expected
.
add
(
"1,2020-01-01T15:35:00.123456,2020-01-01T15:35:00.123456789,15:35,1.175E-37,1.79769E308,100.1234"
);
expected
.
add
(
"2,2020-01-01T15:36:01.123456,2020-01-01T15:36:01.123456789,15:36:01,-1.175E-37,-1.79769E308,101.1234"
);
assertEquals
(
1
,
result
.
size
());
assertTrue
(
"The actual output is not a subset of the expected set."
,
expected
.
containsAll
(
result
));
}
}
flink-connectors/flink-connector-jdbc/src/test/java/org/apache/flink/connector/jdbc/table/JdbcTablePlanTest.java
浏览文件 @
a859e2cc
...
...
@@ -22,6 +22,7 @@ import org.apache.flink.table.api.TableConfig;
import
org.apache.flink.table.planner.utils.StreamTableTestUtil
;
import
org.apache.flink.table.planner.utils.TableTestBase
;
import
org.junit.Before
;
import
org.junit.Test
;
/**
...
...
@@ -31,8 +32,8 @@ public class JdbcTablePlanTest extends TableTestBase {
private
final
StreamTableTestUtil
util
=
streamTestUtil
(
new
TableConfig
());
@
Test
public
void
testProjectionPushDown
()
{
@
Before
public
void
setup
()
{
util
.
tableEnv
().
executeSql
(
"CREATE TABLE jdbc ("
+
"id BIGINT,"
+
...
...
@@ -48,7 +49,15 @@ public class JdbcTablePlanTest extends TableTestBase {
" 'table-name'='test_table'"
+
")"
);
}
@Test
public
void
testProjectionPushDown
()
{
util
.
verifyExecPlan
(
"SELECT decimal_col, timestamp9_col, id FROM jdbc"
);
}
@Test
public
void
testLimitPushDown
()
{
util
.
verifyExecPlan
(
"SELECT id, time_col FROM jdbc LIMIT 3"
);
}
}
flink-connectors/flink-connector-jdbc/src/test/resources/org/apache/flink/connector/jdbc/table/JdbcTablePlanTest.xml
浏览文件 @
a859e2cc
...
...
@@ -16,6 +16,25 @@ See the License for the specific language governing permissions and
limitations under the License.
-->
<Root>
<TestCase
name=
"testLimitPushDown"
>
<Resource
name=
"sql"
>
<![CDATA[SELECT id, time_col FROM jdbc LIMIT 3]]>
</Resource>
<Resource
name=
"ast"
>
<![CDATA[
LogicalSort(fetch=[3])
+- LogicalProject(id=[$0], time_col=[$3])
+- LogicalTableScan(table=[[default_catalog, default_database, jdbc]])
]]>
</Resource>
<Resource
name=
"optimized exec plan"
>
<![CDATA[
Limit(offset=[0], fetch=[3])
+- Exchange(distribution=[single])
+- TableSourceScan(table=[[default_catalog, default_database, jdbc, project=[id, time_col], limit=[3]]], fields=[id, time_col])
]]>
</Resource>
</TestCase>
<TestCase
name=
"testProjectionPushDown"
>
<Resource
name=
"sql"
>
<![CDATA[SELECT decimal_col, timestamp9_col, id FROM jdbc]]>
...
...
flink-table/flink-table-planner-blink/src/main/scala/org/apache/flink/table/planner/plan/rules/FlinkStreamRuleSets.scala
浏览文件 @
a859e2cc
...
...
@@ -244,6 +244,7 @@ object FlinkStreamRuleSets {
PushProjectIntoLegacyTableSourceScanRule
.
INSTANCE
,
PushFilterIntoTableSourceScanRule
.
INSTANCE
,
PushFilterIntoLegacyTableSourceScanRule
.
INSTANCE
,
PushLimitIntoTableSourceScanRule
.
INSTANCE
,
// reorder the projecct and watermark assigner
ProjectWatermarkAssignerTransposeRule
.
INSTANCE
,
...
...
flink-table/flink-table-planner-blink/src/test/resources/org/apache/flink/table/planner/plan/stream/sql/LimitableSourceTest.xml
0 → 100644
浏览文件 @
a859e2cc
此差异已折叠。
点击以展开。
flink-table/flink-table-planner-blink/src/test/scala/org/apache/flink/table/planner/plan/stream/sql/LimitTest.scala
浏览文件 @
a859e2cc
...
...
@@ -22,13 +22,17 @@ import org.apache.flink.api.scala._
import
org.apache.flink.table.api._
import
org.apache.flink.table.planner.utils.TableTestBase
import
org.junit.
Test
import
org.junit.
{
Before
,
Test
}
class
LimitTest
extends
TableTestBase
{
private
val
util
=
streamTestUtil
()
util
.
addDataStream
[(
Int
,
String
,
Long
)](
"MyTable"
,
'a
,
'b
,
'c
,
'proctime
.
proctime
,
'rowtime
.
rowtime
)
protected
val
util
=
streamTestUtil
()
@Before
def
setup
()
:
Unit
=
{
util
.
addDataStream
[(
Int
,
String
,
Long
)](
"MyTable"
,
'a
,
'b
,
'c
,
'proctime
.
proctime
,
'rowtime
.
rowtime
)
}
@Test
def
testLimitWithoutOffset
()
:
Unit
=
{
...
...
flink-table/flink-table-planner-blink/src/test/scala/org/apache/flink/table/planner/plan/stream/sql/LimitableSourceTest.scala
0 → 100644
浏览文件 @
a859e2cc
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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
org.apache.flink.table.planner.plan.stream.sql
import
org.apache.flink.table.planner.plan.rules.logical.PushLimitIntoTableSourceScanRule
import
org.junit.Before
/**
* Test for [[PushLimitIntoTableSourceScanRule]].
*/
class
LimitableSourceTest
extends
LimitTest
{
@Before
override
def
setup
()
:
Unit
=
{
val
ddl
=
s
"""
|CREATE TABLE MyTable (
| a INT,
| b BIGINT,
| c STRING,
| proctime TIMESTAMP(3),
| rowtime TIMESTAMP(3)
|) WITH (
| 'connector' = 'values',
| 'bounded' = 'true'
|)
"""
.
stripMargin
util
.
tableEnv
.
executeSql
(
ddl
)
}
}
flink-table/flink-table-planner-blink/src/test/scala/org/apache/flink/table/planner/runtime/stream/sql/LimitableSourceITCase.scala
0 → 100644
浏览文件 @
a859e2cc
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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
org.apache.flink.table.planner.runtime.stream.sql
import
org.apache.flink.api.scala._
import
org.apache.flink.table.api.bridge.scala._
import
org.apache.flink.table.planner.factories.TestValuesTableFactory
import
org.apache.flink.table.planner.plan.rules.logical.PushLimitIntoTableSourceScanRule
import
org.apache.flink.table.planner.runtime.utils.
{
StreamingTestBase
,
TestingRetractSink
}
import
org.apache.flink.table.planner.runtime.utils.BatchTestBase.row
import
org.apache.flink.types.Row
import
org.junit.Assert.assertEquals
import
org.junit.
{
Before
,
Test
}
/**
* Test for [[PushLimitIntoTableSourceScanRule]].
*/
class
LimitableSourceITCase
extends
StreamingTestBase
()
{
val
data
=
Seq
(
row
(
"book"
,
1
,
12
),
row
(
"book"
,
2
,
19
),
row
(
"book"
,
4
,
11
),
row
(
"fruit"
,
4
,
33
),
row
(
"fruit"
,
3
,
44
),
row
(
"fruit"
,
5
,
22
))
@Before
def
setup
()
:
Unit
=
{
val
dataId
=
TestValuesTableFactory
.
registerData
(
data
)
val
ddl
=
s
"""
|CREATE TABLE Source (
| category STRING,
| shopId INT,
| num INT
|) WITH (
| 'connector' = 'values',
| 'data-id' = '$dataId',
| 'bounded' = 'false'
|)
|"""
.
stripMargin
tEnv
.
executeSql
(
ddl
)
}
@Test
def
testLimit
()
:
Unit
=
{
val
sql
=
"SELECT * FROM Source LIMIT 4"
val
sink
=
new
TestingRetractSink
tEnv
.
sqlQuery
(
sql
).
toRetractStream
[
Row
].
addSink
(
sink
).
setParallelism
(
1
)
env
.
execute
()
val
expected
=
Seq
(
"book,1,12"
,
"book,2,19"
,
"book,4,11"
,
"fruit,4,33"
)
assertEquals
(
expected
.
sorted
,
sink
.
getRetractResults
.
sorted
)
}
@Test
def
testOffsetAndFetch
()
:
Unit
=
{
val
sql
=
"SELECT * FROM Source LIMIT 4 OFFSET 2"
val
sink
=
new
TestingRetractSink
tEnv
.
sqlQuery
(
sql
).
toRetractStream
[
Row
].
addSink
(
sink
).
setParallelism
(
1
)
env
.
execute
()
val
expected
=
Seq
(
"book,4,11"
,
"fruit,4,33"
,
"fruit,3,44"
,
"fruit,5,22"
)
assertEquals
(
expected
.
sorted
,
sink
.
getRetractResults
.
sorted
)
}
}
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