THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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private final Map<ObjectIdentifier, FunctionDefintion> tempFunctions = new LinkedHashMap<>();
Status
Current state: Under Discussion
Discussion thread: http://apache-flink-mailing-list-archive.1008284.n3.nabble.com/DISCUSS-FLIP-57-Rework-FunctionCatalog-td32291.html#a32613
JIRA: FLINK-14090
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Please keep the discussion on the mailing list rather than commenting on the wiki (wiki discussions get unwieldy fast).
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This FLIP would add explicit temporary function support by renaming a few variable names, and potential deprecating renaming some APIs in favor of new APIs that reflects their nature of dealing with temporary functions.
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Their DDLs are “CREATE/DROP TEMPORARY SYSTEM FUNCTION”..
They will be renamed from Existing “registerScalar/Table/AggregateFunctions()” will be deprecated in favor of the new APIs.
b) Temporary Catalog Functions
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Class FunctionIdentifier {
// for temporary/non-temporary system function
// for temporary/non-temporary catalog function
ObjectIdentifier oi;
Optional<ObjectIdentifier> getIdentifier() {}
Optional<String> getSimpleName( getName() {}
Optional<FunctionIdentifier> of(ObjectIdentifier oi) {}
Optional<FunctionIdentifier> of(String name) {}
} |
Changes to CallExpression and UnresolvedCallExpression
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private final Map<String, FunctionDefintion> tempSystemFunctions = new LinkedHashMap<>();
private final Map<FunctionIdentifier, FunctionDefinition> tempFunctions = new LinkedHashMap<>();
public void registerTempSystemScalarFunction(String name, ScalarFunction function) {
// put into tempSystemFunctions
}
public void registerTempSystemTableFunction(String name, TableFunction function) {
// put into tempSystemFunctions
}
public void registerTempSystemAggregateFunction(String name, AggregateFunction function) {
// put into tempSystemFunctions
}
public void registerTempCatalogScalarFunction(ObjectIdentifier foi, ScalarFunction function) {
// put into tempFunctions
}
public void registerTempCatalogTableFunction(ObjectIdentifier fi, TableFunction function) {
// put into tempFunctions
}
public void registerTempCatalogAggregateFunction(ObjectIdentifier fi, AggregateFunction function) {
// put into tempFunctions
}
public void dropTemporarySystemFunction(String name) {}
public void dropTemporaryFunctiondropTemporaryCatalogFunction(FunctionIdentifier fi) {}
public Optional<FunctionLookup.Result> lookupFunction(FunctionIdentifier fi) {
if (fi.getObjectIdentifier().isPresent()) {
// resolvePreciseFunctionReference(fi.getObjectIdentifier());
} else {
resolveAmbiguousFunctionReference(fi.getName());
}
}
private Optional<FunctionLookup.Result> resolvePreciseFunctionReference(FunctionIdentifier fi) {
// resolve order:
// 1. Temporary functions
// 2. Catalog functions
}
private Optional<FunctionLookup.Result> resolveAmbiguousFunctionReference(String name);
// resolve order:
// 1. Temporary system functions
// 2. Builtin functions
// 3. Temporary functions, in the current catalog/db
// 2. Catalog functions, in the current catalog/db
} |
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