fx19880617 commented on a change in pull request #5513:
URL: https://github.com/apache/incubator-pinot/pull/5513#discussion_r437772150
##########
File path:
pinot-broker/src/main/java/org/apache/pinot/broker/requesthandler/BaseBrokerRequestHandler.java
##########
@@ -435,6 +455,115 @@ static void handleQueryLimitOverride(BrokerRequest
brokerRequest, int queryLimit
}
}
+ /**
+ * Check if a SQL parsed BrokerRequest is a literal only query.
+ * @param brokerRequest
+ * @return true if this query selects only Literals
+ *
+ */
+ @VisibleForTesting
+ static boolean isLiteralOnlyQuery(BrokerRequest brokerRequest) {
+ if (brokerRequest.getPinotQuery() != null) {
+ for (Expression e: brokerRequest.getPinotQuery().getSelectList()) {
+ if (!CalciteSqlParser.isLiteralOnlyExpression(e)) {
+ return false;
+ }
+ }
+ return true;
+ }
+ return false;
+ }
+
+ /**
+ * Compute BrokerResponse for literal only query.
+ *
+ * @param brokerRequest
+ * @param compilationStartTimeNs
+ * @param requestStatistics
+ * @return BrokerResponse
+ */
+ private BrokerResponse processLiteralOnlyBrokerRequest(BrokerRequest
brokerRequest, long compilationStartTimeNs,
+ RequestStatistics requestStatistics)
+ throws IllegalStateException {
+ BrokerResponseNative brokerResponse = new BrokerResponseNative();
+ List<String> columnNames = new ArrayList<>();
+ List<DataSchema.ColumnDataType> columnTypes = new ArrayList<>();
+ List<Object> row = new ArrayList<>();
+ for (Expression e : brokerRequest.getPinotQuery().getSelectList()) {
+ computeResultsForExpression(e, columnNames, columnTypes, row);
+ }
+ DataSchema dataSchema =
+ new DataSchema(columnNames.toArray(new String[0]),
columnTypes.toArray(new DataSchema.ColumnDataType[0]));
+ List<Object[]> rows = new ArrayList<>();
+ rows.add(row.toArray());
+ ResultTable resultTable = new ResultTable(dataSchema, rows);
+ brokerResponse.setResultTable(resultTable);
+
+ long totalTimeMs = TimeUnit.NANOSECONDS.toMillis(System.nanoTime() -
compilationStartTimeNs);
+ brokerResponse.setTimeUsedMs(totalTimeMs);
+ requestStatistics.setQueryProcessingTime(totalTimeMs);
+ requestStatistics.setStatistics(brokerResponse);
+ return brokerResponse;
+ }
+
+ private void computeResultsForExpression(Expression e, List<String>
columnNames, List<DataSchema.ColumnDataType> columnTypes,
+ List<Object> row) {
+ if (e.getType() == ExpressionType.LITERAL) {
+ computeResultsForLiteral(e.getLiteral(), columnNames, columnTypes, row);
+ }
+ if (e.getType() == ExpressionType.FUNCTION) {
+ if
(e.getFunctionCall().getOperator().equalsIgnoreCase(SqlKind.AS.toString())) {
+ String columnName =
e.getFunctionCall().getOperands().get(1).getIdentifier().getName();
+ computeResultsForExpression(e.getFunctionCall().getOperands().get(0),
columnNames, columnTypes, row);
+ columnNames.set(columnNames.size() - 1, columnName);
+ } else {
+ throw new IllegalStateException(
+ "No able to compute results for function - " +
e.getFunctionCall().getOperator());
+ }
+ }
+ }
+
+ private void computeResultsForLiteral(Literal literal, List<String>
columnNames, List<DataSchema.ColumnDataType> columnTypes,
+ List<Object> row) {
+ Object fieldValue = literal.getFieldValue();
+ columnNames.add(fieldValue.toString());
+ switch (literal.getSetField()) {
+ case SHORT_VALUE:
+ columnTypes.add(DataSchema.ColumnDataType.INT);
+ row.add((int) literal.getShortValue());
+ break;
+ case INT_VALUE:
+ columnTypes.add(DataSchema.ColumnDataType.INT);
+ row.add(literal.getIntValue());
+ break;
+ case BYTE_VALUE:
Review comment:
done.
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