kunal642 commented on a change in pull request #3834:
URL: https://github.com/apache/carbondata/pull/3834#discussion_r475244586
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File path: sdk/sdk/src/main/java/org/apache/carbondata/sdk/file/CarbonIUD.java
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@@ -0,0 +1,275 @@
+package org.apache.carbondata.sdk.file;
+
+import org.apache.carbondata.common.exceptions.sql.InvalidLoadOptionException;
+import org.apache.carbondata.core.constants.CarbonCommonConstants;
+import org.apache.carbondata.core.datastore.impl.FileFactory;
+import org.apache.carbondata.core.metadata.datatype.DataType;
+import org.apache.carbondata.core.metadata.datatype.Field;
+import org.apache.carbondata.core.scan.expression.ColumnExpression;
+import org.apache.carbondata.core.scan.expression.Expression;
+import org.apache.carbondata.core.scan.expression.LiteralExpression;
+import
org.apache.carbondata.core.scan.expression.conditional.EqualToExpression;
+import org.apache.carbondata.core.scan.expression.logical.AndExpression;
+import org.apache.carbondata.hadoop.api.CarbonTableOutputFormat;
+import org.apache.carbondata.hadoop.internal.ObjectArrayWritable;
+
+import java.io.File;
+import java.io.FilenameFilter;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import com.jcraft.jsch.IO;
+import org.apache.hadoop.io.NullWritable;
+import org.apache.hadoop.mapred.JobConf;
+import org.apache.hadoop.mapreduce.Job;
+import org.apache.hadoop.mapreduce.RecordWriter;
+import org.apache.hadoop.mapreduce.TaskAttemptID;
+import org.apache.hadoop.mapreduce.task.TaskAttemptContextImpl;
+
+public class CarbonIUD {
+
+ private final Map<String, Map<String, String>> filterColumnToValueMapping;
+ private final Map<String, Map<String, String>> updateColumnToValueMapping;
+
+ private CarbonIUD() {
+ filterColumnToValueMapping = new HashMap<>();
+ updateColumnToValueMapping = new HashMap<>();
+ }
+
+ /**
+ * @return CarbonIUD object
+ */
+ public static CarbonIUD getInstance() {
+ return new CarbonIUD();
+ }
+
+ /**
+ * @param path is the segment path on which delete is performed
+ * @param column is the columeName on which records have to be deleted
+ * @param value of column on which the records have to be deleted
+ * @return CarbonIUD object
+ * <p>
+ * for eg: DELETE WHERE column = value
+ */
+ public CarbonIUD delete(String path, String column, String value) {
+ prepareDelete(path, column, value);
+ return this;
+ }
+
+ /**
+ * @param path is the segment path on which delete is performed
+ * @param filterExpression is the expression to delete the records
+ * @throws IOException
+ * @throws InterruptedException
+ */
+ public void delete(String path, Expression filterExpression)
+ throws IOException, InterruptedException {
+ CarbonReader reader = CarbonReader.builder(path, "_temp")
+ .projection(new String[] {
CarbonCommonConstants.CARBON_IMPLICIT_COLUMN_TUPLEID })
+ .filter(filterExpression).build();
+
+ RecordWriter<NullWritable, ObjectArrayWritable> deleteDeltaWriter =
+ CarbonTableOutputFormat.getDeleteDeltaRecordWriter(path);
+ ObjectArrayWritable writable = new ObjectArrayWritable();
+ while (reader.hasNext()) {
+ Object[] row = (Object[]) reader.readNextRow();
+ writable.set(row);
+ deleteDeltaWriter.write(NullWritable.get(), writable);
+ }
+ deleteDeltaWriter.close(null);
+ reader.close();
+ }
+
+ /**
+ * Calling this method will start the execution of delete process
+ * @throws IOException
+ * @throws InterruptedException
+ */
+ public void closeDelete() throws IOException, InterruptedException {
+ for (Map.Entry<String, Map<String, String>> path :
this.filterColumnToValueMapping.entrySet()) {
+ deleteExecution(path.getKey());
+ }
+ this.filterColumnToValueMapping.clear();
+ }
+
+ /**
+ * @param path is the segment path on which update is performed
+ * @param column is the columeName on which records have to be updated
+ * @param value of column on which the records have to be updated
+ * @param updColumn is the name of updatedColumn
+ * @param updValue is the value of updatedColumn
+ * @return CarbonUID
+ * <p>
+ * for eg: UPDATE updColumn = updValue WHERE column = value
+ */
+ public CarbonIUD update(String path, String column, String value, String
updColumn,
+ String updValue) {
+ prepareUpdate(path, column, value, updColumn, updValue);
+ return this;
+ }
+
+ /**
+ * @param path is the segment path on which update is
performed.
+ * @param filterExpression is the expression object to update the
records
+ * @param updatedColumnToValueMapping contains the mapping of updatedColumns
to updatedValues
+ * @throws IOException
+ * @throws InterruptedException
+ * @throws InvalidLoadOptionException
+ */
+ public void update(String path, Expression filterExpression,
+ Map<String, String> updatedColumnToValueMapping)
+ throws IOException, InterruptedException, InvalidLoadOptionException {
+ File[] indexFiles = getCarbonIndexFile(path);
+ Schema schema =
CarbonSchemaReader.readSchema(indexFiles[0].getAbsolutePath()).asOriginOrder();
+ Field[] fields = schema.getFields();
+ String[] projectionColumns = new String[fields.length + 1];
+ for (int i = 0; i < fields.length; i++) {
+ projectionColumns[i] = (fields[i].getFieldName());
+ }
+ projectionColumns[projectionColumns.length - 1] =
+ CarbonCommonConstants.CARBON_IMPLICIT_COLUMN_TUPLEID;
+
+ CarbonWriter writer =
+
CarbonWriter.builder().outputPath(path).withCsvInput(schema).writtenBy("CarbonIUD").build();
+
+ CarbonReader reader =
+ CarbonReader.builder(path,
"_temp").projection(projectionColumns).filter(filterExpression)
+ .build();
+
+ RecordWriter<NullWritable, ObjectArrayWritable> deleteDeltaWriter =
+ CarbonTableOutputFormat.getDeleteDeltaRecordWriter(path);
+ ObjectArrayWritable writable = new ObjectArrayWritable();
+
+ while (reader.hasNext()) {
+ Object[] row = (Object[]) reader.readNextRow();
+ writable.set(Arrays.copyOfRange(row, row.length - 1, row.length));
+ for (Map.Entry<String, String> column :
updatedColumnToValueMapping.entrySet()) {
+ row[getColumnIndex(fields, column.getKey())] = column.getValue();
+ }
+ writer.write(Arrays.copyOfRange(row, 0, row.length - 1));
+ deleteDeltaWriter.write(NullWritable.get(), writable);
+ }
+ deleteDeltaWriter.close(null);
+ writer.close();
+ reader.close();
+ }
+
+ /**
+ * Calling this method will start the execution of update process
+ * @throws IOException
+ * @throws InterruptedException
+ * @throws InvalidLoadOptionException
+ */
+ public void closeUpdate() throws IOException, InterruptedException,
InvalidLoadOptionException {
+ for (Map.Entry<String, Map<String, String>> path :
this.filterColumnToValueMapping.entrySet()) {
+ if (this.updateColumnToValueMapping.containsKey(path.getKey())) {
+ updateExecution(path.getKey());
+ }
+ }
+ this.filterColumnToValueMapping.clear();
+ this.updateColumnToValueMapping.clear();
+ }
+
+ private void updateExecution(String path)
+ throws IOException, InterruptedException, InvalidLoadOptionException {
+ Expression filterExpression = getExpression(path);
+ update(path, filterExpression, this.updateColumnToValueMapping.get(path));
+ }
+
+ private void deleteExecution(String path) throws IOException,
InterruptedException {
+ Expression filterExpression = getExpression(path);
+ delete(path, filterExpression);
+ }
+
+ private void prepareUpdate(String path, String column, String value, String
updColumn,
+ String updValue) {
+ prepareDelete(path, column, value);
+ updColumn = updColumn.toLowerCase().trim();
+ if (this.updateColumnToValueMapping.containsKey(path)) {
+ this.updateColumnToValueMapping.get(path).put(updColumn, updValue);
+ } else {
+ Map<String, String> columnToValue = new HashMap<>();
+ columnToValue.put(updColumn, updValue);
+ this.updateColumnToValueMapping.put(path, columnToValue);
+ }
+ }
+
+ private void prepareDelete(String path, String column, String value) {
+ column = column.toLowerCase().trim();
+ if (this.filterColumnToValueMapping.containsKey(path)) {
+ this.filterColumnToValueMapping.get(path).put(column, value);
+ } else {
+ Map<String, String> columnToValueMapping = new HashMap<>();
+ columnToValueMapping.put(column, value);
+ this.filterColumnToValueMapping.put(path, columnToValueMapping);
+ }
+ }
+
+ private Expression getExpression(String path) throws IOException {
+ File[] indexFiles = getCarbonIndexFile(path);
+ Schema schema =
CarbonSchemaReader.readSchema(indexFiles[0].getAbsolutePath()).asOriginOrder();
+ Field[] fields = schema.getFields();
+ List<EqualToExpression> listOfExpressions = new ArrayList<>();
+ for (Map.Entry<String, String> column :
this.filterColumnToValueMapping.get(path).entrySet()) {
+ DataType dataType = getColumnDataType(fields, column.getKey());
+ listOfExpressions.add(new EqualToExpression(new
ColumnExpression(column.getKey(), dataType),
+ new LiteralExpression(column.getValue(), dataType)));
+ }
+ Expression filterExpression = null;
+ if (listOfExpressions.size() > 0) {
+ filterExpression = listOfExpressions.get(0);
+ }
+ for (int i = 1; i < listOfExpressions.size(); i++) {
+ filterExpression = new AndExpression(filterExpression,
listOfExpressions.get(i));
+ }
+ return filterExpression;
+ }
+
+ private int getColumnIndex(Field[] fields, String column) {
+ int index = -1;
+ for (Field field : fields) {
+ if (field.getFieldName().equals(column)) {
+ index = field.getSchemaOrdinal();
+ break;
+ }
+ }
+ if (index == -1) {
Review comment:
@Karan980 Please check this and add test cases for all the missing types
as well
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