shizy818 commented on code in PR #15354:
URL: https://github.com/apache/iotdb/pull/15354#discussion_r2050362080
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iotdb-core/node-commons/src/main/java/org/apache/iotdb/commons/udf/builtin/relational/tvf/CumulateTableFunction.java:
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@@ -0,0 +1,133 @@
+package org.apache.iotdb.commons.udf.builtin.relational.tvf;
+
+import org.apache.iotdb.udf.api.exception.UDFException;
+import org.apache.iotdb.udf.api.relational.TableFunction;
+import org.apache.iotdb.udf.api.relational.access.Record;
+import org.apache.iotdb.udf.api.relational.table.TableFunctionAnalysis;
+import
org.apache.iotdb.udf.api.relational.table.TableFunctionProcessorProvider;
+import org.apache.iotdb.udf.api.relational.table.argument.Argument;
+import org.apache.iotdb.udf.api.relational.table.argument.DescribedSchema;
+import org.apache.iotdb.udf.api.relational.table.argument.ScalarArgument;
+import org.apache.iotdb.udf.api.relational.table.argument.TableArgument;
+import
org.apache.iotdb.udf.api.relational.table.processor.TableFunctionDataProcessor;
+import
org.apache.iotdb.udf.api.relational.table.specification.ParameterSpecification;
+import
org.apache.iotdb.udf.api.relational.table.specification.ScalarParameterSpecification;
+import
org.apache.iotdb.udf.api.relational.table.specification.TableParameterSpecification;
+import org.apache.iotdb.udf.api.type.Type;
+
+import org.apache.tsfile.block.column.ColumnBuilder;
+
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+
+import static
org.apache.iotdb.commons.udf.builtin.relational.tvf.WindowTVFUtils.findColumnIndex;
+
+public class CumulateTableFunction implements TableFunction {
+
+ private static final String DATA_PARAMETER_NAME = "DATA";
+ private static final String TIMECOL_PARAMETER_NAME = "TIMECOL";
+ private static final String SIZE_PARAMETER_NAME = "SIZE";
+ private static final String STEP_PARAMETER_NAME = "STEP";
+ private static final String ORIGIN_PARAMETER_NAME = "ORIGIN";
+
+ @Override
+ public List<ParameterSpecification> getArgumentsSpecifications() {
+ return Arrays.asList(
+ TableParameterSpecification.builder()
+ .name(DATA_PARAMETER_NAME)
+ .rowSemantics()
+ .passThroughColumns()
+ .build(),
+ ScalarParameterSpecification.builder()
+ .name(TIMECOL_PARAMETER_NAME)
+ .type(Type.STRING)
+ .defaultValue("time")
+ .build(),
+
ScalarParameterSpecification.builder().name(SIZE_PARAMETER_NAME).type(Type.INT64).build(),
+
ScalarParameterSpecification.builder().name(STEP_PARAMETER_NAME).type(Type.INT64).build(),
+ ScalarParameterSpecification.builder()
+ .name(ORIGIN_PARAMETER_NAME)
+ .type(Type.TIMESTAMP)
+ .defaultValue(0L)
+ .build());
+ }
+
+ @Override
+ public TableFunctionAnalysis analyze(Map<String, Argument> arguments) throws
UDFException {
+ // size must be an integral multiple of step.
+ long size = (long) ((ScalarArgument)
arguments.get(SIZE_PARAMETER_NAME)).getValue();
+ long step = (long) ((ScalarArgument)
arguments.get(STEP_PARAMETER_NAME)).getValue();
+
+ if (size % step != 0) {
Review Comment:
It's funny that Flink does not check it either. It throws an error `
java.lang.ArithmeticException: / by zero`. And what's the behavior of negative
number 🤔?
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