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This PR supports a Table Value Function called `Query`. He can push a query directly to the catalog source for execution by specifying `catalog` and `query` without parsing by Doris. Doris only receives the results returned by the query.
Currently only JDBC Catalog is supported.
Example:
```
Doris > desc function query('catalog' = 'mysql','query' = 'select count(*) as cnt from test.test');
+-------+--------+------+------+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-------+--------+------+------+---------+-------+
| cnt | BIGINT | Yes | true | NULL | NONE |
+-------+--------+------+------+---------+-------+
Doris > select * from query('catalog' = 'mysql','query' = 'select count(*) as cnt from test.test');
+----------+
| cnt |
+----------+
| 30000000 |
+----------+
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56
...-core/src/main/java/org/apache/doris/nereids/trees/expressions/functions/table/Query.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,56 @@ | ||
| // 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.doris.nereids.trees.expressions.functions.table; | ||
|
|
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| import org.apache.doris.catalog.FunctionSignature; | ||
| import org.apache.doris.nereids.exceptions.AnalysisException; | ||
| import org.apache.doris.nereids.trees.expressions.Properties; | ||
| import org.apache.doris.nereids.trees.expressions.visitor.ExpressionVisitor; | ||
| import org.apache.doris.nereids.types.coercion.AnyDataType; | ||
| import org.apache.doris.tablefunction.QueryTableValueFunction; | ||
| import org.apache.doris.tablefunction.TableValuedFunctionIf; | ||
|
|
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| import java.util.Map; | ||
|
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| /** query */ | ||
| public class Query extends TableValuedFunction { | ||
| public Query(Properties properties) { | ||
| super("query", properties); | ||
| } | ||
|
|
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| @Override | ||
| public FunctionSignature customSignature() { | ||
| return FunctionSignature.of(AnyDataType.INSTANCE_WITHOUT_INDEX, getArgumentsTypes()); | ||
| } | ||
|
|
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| @Override | ||
| protected TableValuedFunctionIf toCatalogFunction() { | ||
| try { | ||
| Map<String, String> arguments = getTVFProperties().getMap(); | ||
| return QueryTableValueFunction.createQueryTableValueFunction(arguments); | ||
| } catch (Throwable t) { | ||
| throw new AnalysisException("Can not build QueryTableValuedFunction by " | ||
| + this + ": " + t.getMessage(), t); | ||
| } | ||
| } | ||
|
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||
| @Override | ||
| public <R, C> R accept(ExpressionVisitor<R, C> visitor, C context) { | ||
| return visitor.visitQuery(this, context); | ||
| } | ||
| } |
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58 changes: 58 additions & 0 deletions
58
fe/fe-core/src/main/java/org/apache/doris/tablefunction/JdbcQueryTableValueFunction.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,58 @@ | ||
| // 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. | ||
|
|
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| package org.apache.doris.tablefunction; | ||
|
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| import org.apache.doris.analysis.TupleDescriptor; | ||
| import org.apache.doris.catalog.Column; | ||
| import org.apache.doris.catalog.JdbcTable; | ||
| import org.apache.doris.catalog.TableIf.TableType; | ||
| import org.apache.doris.common.AnalysisException; | ||
| import org.apache.doris.datasource.jdbc.JdbcExternalCatalog; | ||
| import org.apache.doris.datasource.jdbc.source.JdbcScanNode; | ||
| import org.apache.doris.planner.PlanNodeId; | ||
| import org.apache.doris.planner.ScanNode; | ||
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| import org.apache.logging.log4j.LogManager; | ||
| import org.apache.logging.log4j.Logger; | ||
|
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| import java.util.List; | ||
| import java.util.Map; | ||
|
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| public class JdbcQueryTableValueFunction extends QueryTableValueFunction { | ||
| public static final Logger LOG = LogManager.getLogger(JdbcQueryTableValueFunction.class); | ||
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| public JdbcQueryTableValueFunction(Map<String, String> params) throws AnalysisException { | ||
| super(params); | ||
| } | ||
|
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| @Override | ||
| public List<Column> getTableColumns() throws AnalysisException { | ||
| JdbcExternalCatalog catalog = (JdbcExternalCatalog) catalogIf; | ||
| return catalog.getColumnsFromQuery(query); | ||
| } | ||
|
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| @Override | ||
| public ScanNode getScanNode(PlanNodeId id, TupleDescriptor desc) { | ||
| JdbcExternalCatalog catalog = (JdbcExternalCatalog) catalogIf; | ||
| JdbcTable jdbcTable = new JdbcTable(1, desc.getTable().getName(), desc.getTable().getFullSchema(), | ||
| TableType.JDBC); | ||
| catalog.configureJdbcTable(jdbcTable, desc.getTable().getName()); | ||
| desc.setTable(jdbcTable); | ||
| return new JdbcScanNode(id, desc, true, query); | ||
| } | ||
| } |
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