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https://issues.apache.org/jira/browse/DRILL-7502?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17011396#comment-17011396
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ASF GitHub Bot commented on DRILL-7502:
---------------------------------------
paul-rogers commented on issue #1945: DRILL-7502: Invalid codegen for typeof()
with UNION
URL: https://github.com/apache/drill/pull/1945#issuecomment-572377107
@vvysotskyi, thanks much for the review. Addressed the one comment I missed
last time. Squashed commits.
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> Incorrect/invalid codegen for typeof() with UNION
> -------------------------------------------------
>
> Key: DRILL-7502
> URL: https://issues.apache.org/jira/browse/DRILL-7502
> Project: Apache Drill
> Issue Type: Bug
> Affects Versions: 1.17.0
> Reporter: Paul Rogers
> Assignee: Paul Rogers
> Priority: Major
> Labels: ready-to-commit
> Fix For: 1.18.0
>
>
> The {{typeof()}} function is defined as follows:
> {code:java}
> @FunctionTemplate(names = {"typeOf"},
> scope = FunctionTemplate.FunctionScope.SIMPLE,
> nulls = NullHandling.INTERNAL)
> public static class GetType implements DrillSimpleFunc {
> @Param
> FieldReader input;
> @Output
> VarCharHolder out;
> @Inject
> DrillBuf buf;
> @Override
> public void setup() {}
> @Override
> public void eval() {
> String typeName = input.getTypeString();
> byte[] type = typeName.getBytes();
> buf = buf.reallocIfNeeded(type.length);
> buf.setBytes(0, type);
> out.buffer = buf;
> out.start = 0;
> out.end = type.length;
> }
> }
> {code}
> Note that the {{input}} field is defined as {{FieldReader}} which has a
> method called {{getTypeString()}}. As a result, the code works fine in all
> existing tests in {{TestTypeFns}}.
> I tried to add a function to use {{typeof()}} on a column of type {{UNION}}.
> When I did, the query failed with a compile error in generated code:
> {noformat}
> SYSTEM ERROR: CompileException: Line 42, Column 43:
> A method named "getTypeString" is not declared in any enclosing class nor
> any supertype, nor through a static import
> {noformat}
> The stack trace shows the generated code; Note that the type of {{input}}
> changes from a reader to a holder, causing code to be invalid:
> {code:java}
> public class ProjectorGen0 {
> DrillBuf work0;
> UnionVector vv1;
> VarCharVector vv6;
> DrillBuf work9;
> VarCharVector vv11;
> DrillBuf work14;
> VarCharVector vv16;
> public void doEval(int inIndex, int outIndex)
> throws SchemaChangeException
> {
> {
> UnionHolder out4 = new UnionHolder();
> {
> out4 .isSet = vv1 .getAccessor().isSet((inIndex));
> if (out4 .isSet == 1) {
> vv1 .getAccessor().get((inIndex), out4);
> }
> }
> //---- start of eval portion of typeOf function. ----//
> VarCharHolder out5 = new VarCharHolder();
> {
> final VarCharHolder out = new VarCharHolder();
> UnionHolder input = out4;
> DrillBuf buf = work0;
> UnionFunctions$GetType_eval:
> {
> String typeName = input.getTypeString();
> byte[] type = typeName.getBytes();
> buf = buf.reallocIfNeeded(type.length);
> buf.setBytes(0, type);
> out.buffer = buf;
> out.start = 0;
> out.end = type.length;
> }
> {code}
> By contrast, here is the generated code for one of the existing
> {{TestTypeFns}} tests where things work:
> {code:java}
> public class ProjectorGen0
> extends ProjectorTemplate
> {
> DrillBuf work0;
> NullableBigIntVector vv1;
> VarCharVector vv7;
> public ProjectorGen0() {
> try {
> __DRILL_INIT__();
> } catch (SchemaChangeException e) {
> throw new UnsupportedOperationException(e);
> }
> }
> public void doEval(int inIndex, int outIndex)
> throws SchemaChangeException
> {
> {
> ..
> //---- start of eval portion of typeOf function. ----//
> VarCharHolder out6 = new VarCharHolder();
> {
> final VarCharHolder out = new VarCharHolder();
> FieldReader input = new NullableIntHolderReaderImpl(out5);
> DrillBuf buf = work0;
> UnionFunctions$GetType_eval:
> {
> String typeName = input.getTypeString();
> byte[] type = typeName.getBytes();
> buf = buf.reallocIfNeeded(type.length);
> buf.setBytes(0, type);
> out.buffer = buf;
> out.start = 0;
> out.end = type.length;
> }
> work0 = buf;
> out6 .start = out.start;
> out6 .end = out.end;
> out6 .buffer = out.buffer;
> }
> //---- end of eval portion of typeOf function. ----//
> {code}
> Notice that the {{input}} variable is of type {{FieldReader}} as expected.
> Queries that work:
> {code:java}
> String sql = "SELECT typeof(CAST(a AS " + castType + ")) FROM (VALUES
> (1)) AS T(a)";
> sql = "SELECT typeof(CAST(a AS " + castType + ")) FROM
> cp.`functions/null.json`";
> String sql = "SELECT typeof(" + expr + ") FROM (VALUES (" + value + "))
> AS T(a)";
> {code}
> Query that fails:
> {code:java}
> String sql ="SELECT typeof(a) AS t, modeof(a) as m, drilltypeof(a) AS
> dt\n" +
> "FROM cp.`jsoninput/union/c.json`";
> {code}
> The queries that work all include either a CAST or constant values. The query
> that fails works with data read from a file. Also, the queries that work use
> scalar types, the query that fails uses the UNION type.
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