feat: support partitioned queries + data boost in Connection API #2540
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,63 @@ | ||
| /* | ||
| * Copyright 2023 Google LLC | ||
| * | ||
| * Licensed 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 com.google.cloud.spanner.connection; | ||
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| import com.google.cloud.spanner.ErrorCode; | ||
| import com.google.cloud.spanner.SpannerExceptionFactory; | ||
| import com.google.cloud.spanner.Statement; | ||
| import com.google.cloud.spanner.connection.AbstractStatementParser.ParsedStatement; | ||
| import com.google.cloud.spanner.connection.ClientSideStatementImpl.CompileException; | ||
| import java.lang.reflect.Method; | ||
| import java.util.regex.Matcher; | ||
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|
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| /** Executor for <code>PARTITION <sql></code> statements. */ | ||
| class ClientSideStatementPartitionExecutor implements ClientSideStatementExecutor { | ||
| private final ClientSideStatementImpl statement; | ||
| private final Method method; | ||
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|
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| ClientSideStatementPartitionExecutor(ClientSideStatementImpl statement) throws CompileException { | ||
| try { | ||
| this.statement = statement; | ||
| this.method = | ||
| ConnectionStatementExecutor.class.getDeclaredMethod( | ||
| statement.getMethodName(), Statement.class); | ||
| } catch (Exception e) { | ||
| throw new CompileException(e, statement); | ||
| } | ||
| } | ||
|
|
||
| @Override | ||
| public StatementResult execute( | ||
| ConnectionStatementExecutor connection, ParsedStatement parsedStatement) throws Exception { | ||
| String sql = getParameterValue(parsedStatement); | ||
| return (StatementResult) | ||
| method.invoke(connection, parsedStatement.getStatement().toBuilder().replace(sql).build()); | ||
| } | ||
|
|
||
| String getParameterValue(ParsedStatement parsedStatement) { | ||
| Matcher matcher = statement.getPattern().matcher(parsedStatement.getSqlWithoutComments()); | ||
| if (matcher.find() && matcher.groupCount() >= 2) { | ||
| String space = matcher.group(1); | ||
| String value = matcher.group(2); | ||
| return (space + value).trim(); | ||
| } | ||
| throw SpannerExceptionFactory.newSpannerException( | ||
| ErrorCode.INVALID_ARGUMENT, | ||
| String.format( | ||
| "Invalid argument for PARTITION: %s", parsedStatement.getStatement().getSql())); | ||
| } | ||
| } | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,81 @@ | ||
| /* | ||
| * Copyright 2023 Google LLC | ||
| * | ||
| * Licensed 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 com.google.cloud.spanner.connection; | ||
|
|
||
| import com.google.cloud.spanner.ErrorCode; | ||
| import com.google.cloud.spanner.SpannerExceptionFactory; | ||
| import com.google.cloud.spanner.Value; | ||
| import com.google.cloud.spanner.connection.AbstractStatementParser.ParsedStatement; | ||
| import com.google.cloud.spanner.connection.ClientSideStatementImpl.CompileException; | ||
| import com.google.common.base.Strings; | ||
| import java.lang.reflect.Method; | ||
| import java.util.regex.Matcher; | ||
|
|
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| /** Executor for <code>RUN PARTITION <partition_id></code> statements. */ | ||
| class ClientSideStatementRunPartitionExecutor implements ClientSideStatementExecutor { | ||
| private final ClientSideStatementImpl statement; | ||
| private final Method method; | ||
|
|
||
| ClientSideStatementRunPartitionExecutor(ClientSideStatementImpl statement) | ||
| throws CompileException { | ||
| try { | ||
| this.statement = statement; | ||
| this.method = | ||
| ConnectionStatementExecutor.class.getDeclaredMethod( | ||
| statement.getMethodName(), String.class); | ||
| } catch (Exception e) { | ||
| throw new CompileException(e, statement); | ||
| } | ||
| } | ||
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||
| @Override | ||
| public StatementResult execute( | ||
| ConnectionStatementExecutor connection, ParsedStatement parsedStatement) throws Exception { | ||
| String partitionId = getParameterValue(parsedStatement); | ||
| if (partitionId == null) { | ||
| throw SpannerExceptionFactory.newSpannerException( | ||
| ErrorCode.INVALID_ARGUMENT, | ||
| "No valid partition id found in statement: " + parsedStatement.getStatement().getSql()); | ||
| } | ||
| return (StatementResult) method.invoke(connection, partitionId); | ||
| } | ||
|
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| String getParameterValue(ParsedStatement parsedStatement) { | ||
| // The statement has the form `RUN PARTITION ['partition-id']`. | ||
| // The regex that is defined for this statement is (simplified) `run\s+partition(?:\s*'(.*)')?` | ||
| // This regex has one capturing group, which captures the partition-id inside the single quotes. | ||
| // That capturing group is however inside a non-capturing optional group. | ||
| // That means that: | ||
| // 1. If the matcher matches and returns one or more groups, we know that we have a partition-id | ||
| // in the SQL statement itself, as that is the only thing that can be in a capturing group. | ||
| // 2. If the matcher matches and returns zero groups, we know that the statement is valid, but | ||
| // that it does not contain a partition-id in the SQL statement. The partition-id must then | ||
| // be included in the statement as a query parameter. | ||
| Matcher matcher = statement.getPattern().matcher(parsedStatement.getSqlWithoutComments()); | ||
| if (matcher.find() && matcher.groupCount() >= 1) { | ||
|
There was a problem hiding this comment.
There was a problem hiding this comment. Added some commentary to explain what is going on with this regex. |
||
| String value = matcher.group(1); | ||
| if (!Strings.isNullOrEmpty(value)) { | ||
| return value; | ||
| } | ||
| } | ||
| if (parsedStatement.getStatement().getParameters().size() == 1) { | ||
| Value value = parsedStatement.getStatement().getParameters().values().iterator().next(); | ||
| return value.getAsString(); | ||
| } | ||
| return null; | ||
| } | ||
| } | ||
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Suggestion -
StringBuilderwould be a bit more optimal as compared to+operation.There was a problem hiding this comment.
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The Java compiler automatically optimizes this internally, as it is not dynamic concatenation (e.g. in a loop or other hard-to-understand construct), so for these simple cases you should keep it as is. You will see that if you change this to using a StringBuilder, IntelliJ will even give you a warning.