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https://issues.apache.org/jira/browse/DRILL-6810?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16660492#comment-16660492
]
ASF GitHub Bot commented on DRILL-6810:
---------------------------------------
arina-ielchiieva commented on a change in pull request #1509: DRILL-6810:
Disable NULL_IF_NULL NullHandling for functions with Comp…
URL: https://github.com/apache/drill/pull/1509#discussion_r227349104
##########
File path:
exec/java-exec/src/main/java/org/apache/drill/exec/expr/fn/impl/ParseQueryFunction.java
##########
@@ -23,65 +23,157 @@
import org.apache.drill.exec.expr.annotations.Output;
import org.apache.drill.exec.expr.annotations.Param;
import org.apache.drill.exec.expr.holders.NullableVarCharHolder;
+import org.apache.drill.exec.expr.holders.VarCharHolder;
import org.apache.drill.exec.vector.complex.writer.BaseWriter;
import javax.inject.Inject;
-@FunctionTemplate(
- name="parse_query",
- scope= FunctionTemplate.FunctionScope.SIMPLE,
- nulls = FunctionTemplate.NullHandling.NULL_IF_NULL
-)
+/**
+ * The function splits up a query string and returns a map of the key-value
pairs.
+ * For example, {@code parse_query('url?arg1=x&arg2=y')} will return:
+ * <pre>
+ * {
+ * "arg1": "x",
+ * "arg2": "y"
+ * }
+ * </pre>
+ */
+public class ParseQueryFunction {
-public class ParseQueryFunction implements DrillSimpleFunc {
+ @FunctionTemplate(name = "parse_query", scope =
FunctionTemplate.FunctionScope.SIMPLE)
+ public static class ParseQuery implements DrillSimpleFunc {
@Param
- NullableVarCharHolder input;
-
+ VarCharHolder in;
@Output
BaseWriter.ComplexWriter outWriter;
-
@Inject
DrillBuf outBuffer;
+ @Override
public void setup() {
}
+ @Override
public void eval() {
-
- org.apache.drill.exec.vector.complex.writer.BaseWriter.MapWriter
queryMapWriter = outWriter.rootAsMap();
-
- String queryString =
org.apache.drill.exec.expr.fn.impl.StringFunctionHelpers.toStringFromUTF8(input.start,
input.end, input.buffer);
-
- if( queryString.isEmpty() || queryString.equals("null")){
- queryString = "";
+ org.apache.drill.exec.vector.complex.writer.BaseWriter.MapWriter
mapWriter = outWriter.rootAsMap();
+
+ String queryString =
+
org.apache.drill.exec.expr.fn.impl.StringFunctionHelpers.toStringFromUTF8(in.start,
in.end, in.buffer);
+ int questionMarkIndex = queryString.indexOf("?");
+ if (questionMarkIndex > -1) {
+ // Leave query parameters only
+ queryString = queryString.substring(questionMarkIndex + 1);
+ }
+
+ if (queryString.trim().isEmpty() || queryString.equals("null")) {
Review comment:
`equalsIgnoreCase`?
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> Disable NULL_IF_NULL NullHandling for functions with ComplexWriter
> ------------------------------------------------------------------
>
> Key: DRILL-6810
> URL: https://issues.apache.org/jira/browse/DRILL-6810
> Project: Apache Drill
> Issue Type: Bug
> Affects Versions: 1.14.0
> Reporter: Bohdan Kazydub
> Assignee: Bohdan Kazydub
> Priority: Major
> Fix For: 1.15.0
>
>
> Currently NullHandling.NULL_IF_NULL is allowed for UDFs with @Output of type
> org.apache.drill.exec.vector.complex.writer.BaseWriter.ComplexWriter but no
> null handling is performed for the kind of functions which leads to
> confusion. The problem is ComplexWriter holds list/map values and Drill does
> not yet support NULL values for the types (there is an issue to allow null
> maps/lists in [DRILL-4824|https://issues.apache.org/jira/browse/DRILL-4824]).
> For such functions support for NULL_IF_NULL will be disabled, as it is done
> for aggregate functions, and NullHandling.INTERNAL should be used instead.
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