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Posted to commits@druid.apache.org by GitBox <gi...@apache.org> on 2022/02/04 23:17:39 UTC
[GitHub] [druid] gianm commented on a change in pull request #12163: Add syntax support for PARTITIONED BY/CLUSTERED BY in INSERT queries
gianm commented on a change in pull request #12163:
URL: https://github.com/apache/druid/pull/12163#discussion_r799847786
##########
File path: sql/src/main/java/org/apache/druid/sql/calcite/parser/DruidSqlInsert.java
##########
@@ -0,0 +1,101 @@
+/*
+ * 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.druid.sql.calcite.parser;
+
+import com.google.common.base.Preconditions;
+import org.apache.calcite.sql.SqlInsert;
+import org.apache.calcite.sql.SqlNode;
+import org.apache.calcite.sql.SqlNodeList;
+import org.apache.calcite.sql.SqlOperator;
+import org.apache.calcite.sql.SqlWriter;
+import org.apache.druid.java.util.common.granularity.Granularity;
+
+import javax.annotation.Nonnull;
+import javax.annotation.Nullable;
+
+/**
+ * Extends the 'insert' call to hold custom parameters specific to Druid i.e. PARTITIONED BY and CLUSTERED BY
+ * This class extends the {@link SqlInsert} so that this SqlNode can be used in
+ * {@link org.apache.calcite.sql2rel.SqlToRelConverter} for getting converted into RelNode, and further processing
+ */
+public class DruidSqlInsert extends SqlInsert
+{
+ public static final String SQL_INSERT_SEGMENT_GRANULARITY = "sqlInsertSegmentGranularity";
+
+ // This allows reusing super.unparse
+ public static final SqlOperator OPERATOR = SqlInsert.OPERATOR;
+
+ private final Granularity partitionedBy;
+
+ @Nullable
+ private final SqlNodeList clusteredBy;
+
+ public DruidSqlInsert(
+ @Nonnull SqlInsert insertNode,
+ @Nonnull Granularity partitionedBy,
+ @Nullable SqlNodeList clusteredBy
+ )
+ {
+ super(
+ insertNode.getParserPosition(),
+ (SqlNodeList) insertNode.getOperandList().get(0), // No better getter to extract this
+ insertNode.getTargetTable(),
+ insertNode.getSource(),
+ insertNode.getTargetColumnList()
+ );
+ Preconditions.checkNotNull(partitionedBy); // Shouldn't hit due to how the parser is written
+ this.partitionedBy = partitionedBy;
+ this.clusteredBy = clusteredBy;
+ }
+
+ @Nullable
+ public SqlNodeList getClusteredBy()
+ {
+ return clusteredBy;
+ }
+
+ public Granularity getPartitionedBy()
+ {
+ return partitionedBy;
+ }
+
+ @Nonnull
+ @Override
+ public SqlOperator getOperator()
+ {
+ return OPERATOR;
+ }
+
+ @Override
+ public void unparse(SqlWriter writer, int leftPrec, int rightPrec)
+ {
+ super.unparse(writer, leftPrec, rightPrec);
+ writer.keyword("PARTITIONED BY");
+ writer.keyword(getPartitionedBy().toString()); // TODO: Make it cleaner by directly unparsing the SqlNode
Review comment:
Does this `unparse` method get used anywhere? If so, we need to fix this because it's going to be incorrect in a bunch of cases. Or if it doesn't get used anywhere, IMO it's better to throw UnsupportedOperationException rather than have a broken implementation. At least that way it's clear that the method isn't reliable.
##########
File path: sql/src/main/java/org/apache/druid/sql/calcite/parser/DruidSqlParserUtils.java
##########
@@ -0,0 +1,165 @@
+/*
+ * 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.druid.sql.calcite.parser;
+
+import com.google.common.base.Preconditions;
+import org.apache.calcite.sql.SqlCall;
+import org.apache.calcite.sql.SqlIdentifier;
+import org.apache.calcite.sql.SqlIntervalQualifier;
+import org.apache.calcite.sql.SqlKind;
+import org.apache.calcite.sql.SqlLiteral;
+import org.apache.calcite.sql.SqlNode;
+import org.apache.druid.java.util.common.StringUtils;
+import org.apache.druid.java.util.common.granularity.Granularity;
+import org.apache.druid.java.util.common.granularity.PeriodGranularity;
+import org.apache.druid.segment.column.ColumnHolder;
+import org.apache.druid.sql.calcite.expression.TimeUnits;
+import org.apache.druid.sql.calcite.expression.builtin.TimeFloorOperatorConversion;
+import org.joda.time.Period;
+
+import java.util.List;
+
+public class DruidSqlParserUtils
+{
+ /**
+ * Delegates to {@code convertSqlNodeToGranularity} and converts the exceptions to {@link ParseException}
+ * with the underlying message
+ */
+ public static Granularity convertSqlNodeToGranularityThrowingParseExceptions(SqlNode sqlNode) throws ParseException
+ {
+ Granularity g;
+ try {
+ g = convertSqlNodeToGranularity(sqlNode);
+ }
+ catch (Exception e) {
+ throw new ParseException(e.getMessage());
+ }
+ return g;
+ }
+
+ /**
+ * This method is used to extract the granularity from a SqlNode representing following function calls:
+ * 1. FLOOR(__time TO TimeUnit)
+ * 2. TIME_FLOOR(__time, 'PT1H')
+ *
+ * Validation on the sqlNode is contingent to following conditions:
+ * 1. sqlNode is an instance of SqlCall
+ * 2. Operator is either one of TIME_FLOOR or FLOOR
+ * 3. Number of operands in the call are 2
+ * 4. First operand is a SimpleIdentifier representing __time
+ * 5. If operator is TIME_FLOOR, the second argument is a literal, and can be converted to the Granularity class
+ * 6. If operator is FLOOR, the second argument is a TimeUnit, and can be mapped using {@link TimeUnits}
+ *
+ * Since it is to be used primarily while parsing the SqlNode, it is wrapped in {@code convertSqlNodeToGranularityThrowingParseExceptions}
+ *
+ * @param sqlNode SqlNode representing a call to a function
+ * @return Granularity as intended by the function call
+ * @throws ParseException SqlNode cannot be converted a granularity
+ */
+ public static Granularity convertSqlNodeToGranularity(SqlNode sqlNode) throws ParseException
+ {
+
+ final String genericParseFailedMessageFormatString = "Unable to parse the granularity from %s. Expected HOUR, DAY, MONTH, YEAR, ALL TIME, FLOOR function or %s function";
Review comment:
"parse the granularity" sounds strange to me, grammatically. How about this:
```
Encountered <%s> after PARTITIONED BY. Expected HOUR, DAY, MONTH, YEAR, ALL TIME, FLOOR(__time TO <timeUnit>) or %s(__time, '<period>').
```
##########
File path: sql/src/main/java/org/apache/druid/sql/calcite/parser/DruidSqlParserUtils.java
##########
@@ -0,0 +1,165 @@
+/*
+ * 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.druid.sql.calcite.parser;
+
+import com.google.common.base.Preconditions;
+import org.apache.calcite.sql.SqlCall;
+import org.apache.calcite.sql.SqlIdentifier;
+import org.apache.calcite.sql.SqlIntervalQualifier;
+import org.apache.calcite.sql.SqlKind;
+import org.apache.calcite.sql.SqlLiteral;
+import org.apache.calcite.sql.SqlNode;
+import org.apache.druid.java.util.common.StringUtils;
+import org.apache.druid.java.util.common.granularity.Granularity;
+import org.apache.druid.java.util.common.granularity.PeriodGranularity;
+import org.apache.druid.segment.column.ColumnHolder;
+import org.apache.druid.sql.calcite.expression.TimeUnits;
+import org.apache.druid.sql.calcite.expression.builtin.TimeFloorOperatorConversion;
+import org.joda.time.Period;
+
+import java.util.List;
+
+public class DruidSqlParserUtils
+{
+ /**
+ * Delegates to {@code convertSqlNodeToGranularity} and converts the exceptions to {@link ParseException}
+ * with the underlying message
+ */
+ public static Granularity convertSqlNodeToGranularityThrowingParseExceptions(SqlNode sqlNode) throws ParseException
+ {
+ Granularity g;
+ try {
+ g = convertSqlNodeToGranularity(sqlNode);
+ }
+ catch (Exception e) {
+ throw new ParseException(e.getMessage());
+ }
+ return g;
+ }
+
+ /**
+ * This method is used to extract the granularity from a SqlNode representing following function calls:
+ * 1. FLOOR(__time TO TimeUnit)
+ * 2. TIME_FLOOR(__time, 'PT1H')
+ *
+ * Validation on the sqlNode is contingent to following conditions:
+ * 1. sqlNode is an instance of SqlCall
+ * 2. Operator is either one of TIME_FLOOR or FLOOR
+ * 3. Number of operands in the call are 2
+ * 4. First operand is a SimpleIdentifier representing __time
+ * 5. If operator is TIME_FLOOR, the second argument is a literal, and can be converted to the Granularity class
+ * 6. If operator is FLOOR, the second argument is a TimeUnit, and can be mapped using {@link TimeUnits}
+ *
+ * Since it is to be used primarily while parsing the SqlNode, it is wrapped in {@code convertSqlNodeToGranularityThrowingParseExceptions}
+ *
+ * @param sqlNode SqlNode representing a call to a function
+ * @return Granularity as intended by the function call
+ * @throws ParseException SqlNode cannot be converted a granularity
+ */
+ public static Granularity convertSqlNodeToGranularity(SqlNode sqlNode) throws ParseException
+ {
+
+ final String genericParseFailedMessageFormatString = "Unable to parse the granularity from %s. Expected HOUR, DAY, MONTH, YEAR, ALL TIME, FLOOR function or %s function";
+
+ if (!(sqlNode instanceof SqlCall)) {
+ throw new ParseException(StringUtils.format(
+ genericParseFailedMessageFormatString,
+ sqlNode.toString(),
+ TimeFloorOperatorConversion.SQL_FUNCTION_NAME
+ ));
+ }
+ SqlCall sqlCall = (SqlCall) sqlNode;
+
+ String operatorName = sqlCall.getOperator().getName();
+
+ Preconditions.checkArgument(
+ "FLOOR".equalsIgnoreCase(operatorName)
+ || TimeFloorOperatorConversion.SQL_FUNCTION_NAME.equalsIgnoreCase(operatorName),
+ StringUtils.format(
+ "PARTITIONED BY clause can only parse FLOOR and %s functions.",
+ TimeFloorOperatorConversion.SQL_FUNCTION_NAME
+ )
+ );
+
+ List<SqlNode> operandList = sqlCall.getOperandList();
+ Preconditions.checkArgument(
+ operandList.size() == 2,
+ StringUtils.format("Invalid number of arguments passed to %s in PARTIITONED BY clause", operatorName)
Review comment:
How about:
> %s in PARTITIONED BY must have two arguments.
(Even if you don't change this, PARTIITONED is misspelled, so please fix that at least.)
##########
File path: sql/src/main/java/org/apache/druid/sql/calcite/planner/DruidPlanner.java
##########
@@ -765,13 +786,65 @@ static ParsedNodes create(final SqlNode node) throws ValidationException
if (query.getKind() == SqlKind.INSERT) {
insert = (SqlInsert) query;
query = insert.getSource();
+
+ // Processing to be done when the original query has either of the PARTITION BY or CLUSTER BY clause
+ if (insert instanceof DruidSqlInsert) {
Review comment:
Makes sense to me to do it in a follow up. We do need to do it, though, so EXPLAIN on INSERT works properly.
##########
File path: sql/src/main/java/org/apache/druid/sql/calcite/parser/DruidSqlParserUtils.java
##########
@@ -0,0 +1,165 @@
+/*
+ * 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.druid.sql.calcite.parser;
+
+import com.google.common.base.Preconditions;
+import org.apache.calcite.sql.SqlCall;
+import org.apache.calcite.sql.SqlIdentifier;
+import org.apache.calcite.sql.SqlIntervalQualifier;
+import org.apache.calcite.sql.SqlKind;
+import org.apache.calcite.sql.SqlLiteral;
+import org.apache.calcite.sql.SqlNode;
+import org.apache.druid.java.util.common.StringUtils;
+import org.apache.druid.java.util.common.granularity.Granularity;
+import org.apache.druid.java.util.common.granularity.PeriodGranularity;
+import org.apache.druid.segment.column.ColumnHolder;
+import org.apache.druid.sql.calcite.expression.TimeUnits;
+import org.apache.druid.sql.calcite.expression.builtin.TimeFloorOperatorConversion;
+import org.joda.time.Period;
+
+import java.util.List;
+
+public class DruidSqlParserUtils
+{
+ /**
+ * Delegates to {@code convertSqlNodeToGranularity} and converts the exceptions to {@link ParseException}
+ * with the underlying message
+ */
+ public static Granularity convertSqlNodeToGranularityThrowingParseExceptions(SqlNode sqlNode) throws ParseException
+ {
+ Granularity g;
+ try {
+ g = convertSqlNodeToGranularity(sqlNode);
Review comment:
You could simplify this to `return convertSqlNodeToGranularity(sqlNode);`. The variable `g` isn't necessary.
##########
File path: sql/src/main/java/org/apache/druid/sql/calcite/parser/DruidSqlInsert.java
##########
@@ -0,0 +1,101 @@
+/*
+ * 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.druid.sql.calcite.parser;
+
+import com.google.common.base.Preconditions;
+import org.apache.calcite.sql.SqlInsert;
+import org.apache.calcite.sql.SqlNode;
+import org.apache.calcite.sql.SqlNodeList;
+import org.apache.calcite.sql.SqlOperator;
+import org.apache.calcite.sql.SqlWriter;
+import org.apache.druid.java.util.common.granularity.Granularity;
+
+import javax.annotation.Nonnull;
+import javax.annotation.Nullable;
+
+/**
+ * Extends the 'insert' call to hold custom parameters specific to Druid i.e. PARTITIONED BY and CLUSTERED BY
+ * This class extends the {@link SqlInsert} so that this SqlNode can be used in
+ * {@link org.apache.calcite.sql2rel.SqlToRelConverter} for getting converted into RelNode, and further processing
+ */
+public class DruidSqlInsert extends SqlInsert
+{
+ public static final String SQL_INSERT_SEGMENT_GRANULARITY = "sqlInsertSegmentGranularity";
+
+ // This allows reusing super.unparse
+ public static final SqlOperator OPERATOR = SqlInsert.OPERATOR;
+
+ private final Granularity partitionedBy;
+
+ @Nullable
+ private final SqlNodeList clusteredBy;
+
+ public DruidSqlInsert(
+ @Nonnull SqlInsert insertNode,
+ @Nonnull Granularity partitionedBy,
+ @Nullable SqlNodeList clusteredBy
+ )
+ {
+ super(
+ insertNode.getParserPosition(),
+ (SqlNodeList) insertNode.getOperandList().get(0), // No better getter to extract this
+ insertNode.getTargetTable(),
+ insertNode.getSource(),
+ insertNode.getTargetColumnList()
+ );
+ Preconditions.checkNotNull(partitionedBy); // Shouldn't hit due to how the parser is written
+ this.partitionedBy = partitionedBy;
+ this.clusteredBy = clusteredBy;
+ }
+
+ @Nullable
+ public SqlNodeList getClusteredBy()
+ {
+ return clusteredBy;
+ }
+
+ public Granularity getPartitionedBy()
+ {
+ return partitionedBy;
+ }
+
+ @Nonnull
+ @Override
+ public SqlOperator getOperator()
+ {
+ return OPERATOR;
+ }
+
+ @Override
+ public void unparse(SqlWriter writer, int leftPrec, int rightPrec)
+ {
+ super.unparse(writer, leftPrec, rightPrec);
+ writer.keyword("PARTITIONED BY");
+ writer.keyword(getPartitionedBy().toString()); // TODO: Make it cleaner by directly unparsing the SqlNode
+ if (getClusteredBy() != null) {
+ writer.sep("CLUSTERED BY");
Review comment:
Why `sep` rather than `keyword`? `sep` is supposed to be for list separators, which doesn't seem right here.
##########
File path: sql/src/main/java/org/apache/druid/sql/calcite/planner/DruidPlanner.java
##########
@@ -744,18 +755,28 @@ public T next()
private SqlNode query;
- private ParsedNodes(@Nullable SqlExplain explain, @Nullable SqlInsert insert, SqlNode query)
+ @Nullable
+ private String ingestionGranularity;
+
+ private ParsedNodes(
+ @Nullable SqlExplain explain,
+ @Nullable SqlInsert insert,
Review comment:
I see. But we'll need EXPLAIN on INSERT to work eventually, so we'll need to clean this up at some point.
##########
File path: sql/src/main/java/org/apache/druid/sql/calcite/parser/DruidSqlParserUtils.java
##########
@@ -0,0 +1,165 @@
+/*
+ * 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.druid.sql.calcite.parser;
+
+import com.google.common.base.Preconditions;
+import org.apache.calcite.sql.SqlCall;
+import org.apache.calcite.sql.SqlIdentifier;
+import org.apache.calcite.sql.SqlIntervalQualifier;
+import org.apache.calcite.sql.SqlKind;
+import org.apache.calcite.sql.SqlLiteral;
+import org.apache.calcite.sql.SqlNode;
+import org.apache.druid.java.util.common.StringUtils;
+import org.apache.druid.java.util.common.granularity.Granularity;
+import org.apache.druid.java.util.common.granularity.PeriodGranularity;
+import org.apache.druid.segment.column.ColumnHolder;
+import org.apache.druid.sql.calcite.expression.TimeUnits;
+import org.apache.druid.sql.calcite.expression.builtin.TimeFloorOperatorConversion;
+import org.joda.time.Period;
+
+import java.util.List;
+
+public class DruidSqlParserUtils
+{
+ /**
+ * Delegates to {@code convertSqlNodeToGranularity} and converts the exceptions to {@link ParseException}
+ * with the underlying message
+ */
+ public static Granularity convertSqlNodeToGranularityThrowingParseExceptions(SqlNode sqlNode) throws ParseException
+ {
+ Granularity g;
+ try {
+ g = convertSqlNodeToGranularity(sqlNode);
+ }
+ catch (Exception e) {
+ throw new ParseException(e.getMessage());
+ }
+ return g;
+ }
+
+ /**
+ * This method is used to extract the granularity from a SqlNode representing following function calls:
+ * 1. FLOOR(__time TO TimeUnit)
+ * 2. TIME_FLOOR(__time, 'PT1H')
+ *
+ * Validation on the sqlNode is contingent to following conditions:
+ * 1. sqlNode is an instance of SqlCall
+ * 2. Operator is either one of TIME_FLOOR or FLOOR
+ * 3. Number of operands in the call are 2
+ * 4. First operand is a SimpleIdentifier representing __time
+ * 5. If operator is TIME_FLOOR, the second argument is a literal, and can be converted to the Granularity class
+ * 6. If operator is FLOOR, the second argument is a TimeUnit, and can be mapped using {@link TimeUnits}
+ *
+ * Since it is to be used primarily while parsing the SqlNode, it is wrapped in {@code convertSqlNodeToGranularityThrowingParseExceptions}
+ *
+ * @param sqlNode SqlNode representing a call to a function
+ * @return Granularity as intended by the function call
+ * @throws ParseException SqlNode cannot be converted a granularity
+ */
+ public static Granularity convertSqlNodeToGranularity(SqlNode sqlNode) throws ParseException
+ {
+
+ final String genericParseFailedMessageFormatString = "Unable to parse the granularity from %s. Expected HOUR, DAY, MONTH, YEAR, ALL TIME, FLOOR function or %s function";
+
+ if (!(sqlNode instanceof SqlCall)) {
+ throw new ParseException(StringUtils.format(
+ genericParseFailedMessageFormatString,
+ sqlNode.toString(),
+ TimeFloorOperatorConversion.SQL_FUNCTION_NAME
+ ));
+ }
+ SqlCall sqlCall = (SqlCall) sqlNode;
+
+ String operatorName = sqlCall.getOperator().getName();
+
+ Preconditions.checkArgument(
+ "FLOOR".equalsIgnoreCase(operatorName)
+ || TimeFloorOperatorConversion.SQL_FUNCTION_NAME.equalsIgnoreCase(operatorName),
+ StringUtils.format(
+ "PARTITIONED BY clause can only parse FLOOR and %s functions.",
Review comment:
The verb "parse" here seems out of place. The clause doesn't do the parsing; the parser does the parsing.
How about including the same error message as above? I don't think this message needs to be different; the earlier one makes total sense here.
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