flink版本：1.11.1
udaf函数代码来自于阿里云官网文档
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以下是代码
public class TestSql {
public static void main(String[] args) throws Exception {
StreamExecutionEnvironment env =
StreamExecutionEnvironment.getExecutionEnvironment();
StreamTableEnvironment tableEnv = FlinkUtils.getTableEnv(env);
//env.setParallelism(3);
tableEnv.createTemporarySystemFunction("count_uadf", CountUdaf.class);
Properties configs = CommonUtils.getConfigs();
//注册clazz源表
FlinkUtils.registerMysqlTable2FlinkTable(
tableEnv,configs.getProperty("url"),
configs.getProperty("user.name"),
configs.getProperty("password"),
“test", "clazz_lesson");
Table table = tableEnv.sqlQuery("select
count_uadf(clazz_number),clazz_number from clazz_lesson group by clazz_number");
//Table table = tableEnv.sqlQuery("select
number,collect(extension_value) from clazz_extension group by number ");
tableEnv.toRetractStream(table, Row.class).print();
env.execute();
}
}
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public class CountUdaf extends AggregateFunction<Long, CountUdaf.CountAccum> {
//定义存放count UDAF状态的accumulator的数据的结构。
public static class CountAccum {
public long total;
}
@Override
//初始化count UDAF的accumulator。
public CountAccum createAccumulator() {
CountAccum acc = new CountAccum();
acc.total = 0;
return acc;
}
@Override
//getValue提供了如何通过存放状态的accumulator计算count UDAF的结果的方法。
public Long getValue(CountAccum accumulator) {
return accumulator.total;
}
//accumulate提供了如何根据输入的数据更新count UDAF存放状态的accumulator。
public void accumulate(CountAccum accumulator, Long iValue) {
accumulator.total++;
}
public void merge(CountAccum accumulator, Iterable<CountAccum> its) {
for (CountAccum other : its) {
accumulator.total += other.total;
}
}
}
以下是堆栈信息
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Exception in thread "main" org.apache.flink.table.api.ValidationException: SQL
validation failed. From line 1, column 8 to line 1, column 31: No match found
for function signature count_uadf(<NUMERIC>)
at
org.apache.flink.table.planner.calcite.FlinkPlannerImpl.org$apache$flink$table$planner$calcite$FlinkPlannerImpl$$validate(FlinkPlannerImpl.scala:146)
at
org.apache.flink.table.planner.calcite.FlinkPlannerImpl.validate(FlinkPlannerImpl.scala:108)
at
org.apache.flink.table.planner.operations.SqlToOperationConverter.convert(SqlToOperationConverter.java:185)
at
org.apache.flink.table.planner.delegation.ParserImpl.parse(ParserImpl.java:78)
at
org.apache.flink.table.api.internal.TableEnvironmentImpl.sqlQuery(TableEnvironmentImpl.java:664)
at
com.gaotu.data.performance.flink.job.sql.TestSql.main(TestSql.java:34)
Caused by: org.apache.calcite.runtime.CalciteContextException: From line 1,
column 8 to line 1, column 31: No match found for function signature
count_uadf(<NUMERIC>)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at
org.apache.calcite.runtime.Resources$ExInstWithCause.ex(Resources.java:457)
at org.apache.calcite.sql.SqlUtil.newContextException(SqlUtil.java:839)
at org.apache.calcite.sql.SqlUtil.newContextException(SqlUtil.java:824)
at
org.apache.calcite.sql.validate.SqlValidatorImpl.newValidationError(SqlValidatorImpl.java:5089)
at
org.apache.calcite.sql.validate.SqlValidatorImpl.handleUnresolvedFunction(SqlValidatorImpl.java:1882)
at org.apache.calcite.sql.SqlFunction.deriveType(SqlFunction.java:305)
at org.apache.calcite.sql.SqlFunction.deriveType(SqlFunction.java:218)
at
org.apache.calcite.sql.validate.SqlValidatorImpl$DeriveTypeVisitor.visit(SqlValidatorImpl.java:5858)
at
org.apache.calcite.sql.validate.SqlValidatorImpl$DeriveTypeVisitor.visit(SqlValidatorImpl.java:5845)
at org.apache.calcite.sql.SqlCall.accept(SqlCall.java:139)
at
org.apache.calcite.sql.validate.SqlValidatorImpl.deriveTypeImpl(SqlValidatorImpl.java:1800)
at
org.apache.calcite.sql.validate.SqlValidatorImpl.deriveType(SqlValidatorImpl.java:1785)
at
org.apache.calcite.sql.validate.SqlValidatorImpl.expandSelectItem(SqlValidatorImpl.java:481)
at
org.apache.calcite.sql.validate.SqlValidatorImpl.validateSelectList(SqlValidatorImpl.java:4255)
at
org.apache.calcite.sql.validate.SqlValidatorImpl.validateSelect(SqlValidatorImpl.java:3523)
at
org.apache.calcite.sql.validate.SelectNamespace.validateImpl(SelectNamespace.java:60)
at
org.apache.calcite.sql.validate.AbstractNamespace.validate(AbstractNamespace.java:84)
at
org.apache.calcite.sql.validate.SqlValidatorImpl.validateNamespace(SqlValidatorImpl.java:1110)
at
org.apache.calcite.sql.validate.SqlValidatorImpl.validateQuery(SqlValidatorImpl.java:1084)
at org.apache.calcite.sql.SqlSelect.validate(SqlSelect.java:232)
at
org.apache.calcite.sql.validate.SqlValidatorImpl.validateScopedExpression(SqlValidatorImpl.java:1059)
at
org.apache.calcite.sql.validate.SqlValidatorImpl.validate(SqlValidatorImpl.java:766)
at
org.apache.flink.table.planner.calcite.FlinkPlannerImpl.org$apache$flink$table$planner$calcite$FlinkPlannerImpl$$validate(FlinkPlannerImpl.scala:141)
... 5 more
Caused by: org.apache.calcite.sql.validate.SqlValidatorException: No match
found for function signature count_uadf(<NUMERIC>)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at
org.apache.calcite.runtime.Resources$ExInstWithCause.ex(Resources.java:457)
at org.apache.calcite.runtime.Resources$ExInst.ex(Resources.java:550)
... 27 more
