[ES|QL] MapExpression improvements. #129759
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afoucret
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Jun 20, 2025
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| functionExpression | ||
| : functionName LP (ASTERISK | (booleanExpression (COMMA booleanExpression)* (COMMA mapExpression)?))? RP | ||
| | functionName LP mapExpression? RP |
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ℹ️ A small grammar change to allow a function that have only optional params which is currently impossible
my_function({"foo": "bar"})
afoucret
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Jun 20, 2025
| return new Literal(source, BytesRefs.toBytesRef(literal), KEYWORD); | ||
| } | ||
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| public static Literal keyword(Source source, Collection<String> literal) { |
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ℹ️ Make it easier to instantiate multivalued strings literals, especially in tests
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Jun 20, 2025
| if (ctx.mapExpression() != null) { | ||
| MapExpression mapArg = visitMapExpression(ctx.mapExpression()); | ||
| args.add(mapArg); | ||
| args = Stream.concat(args.stream(), Stream.of(mapArg)).toList(); |
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ℹ️ Sometimes the list is read only (e.g visitList use emptyList).
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Jun 20, 2025
| "Invalid named function argument [{}], empty key is not supported", | ||
| entry.getText() | ||
| ); | ||
| throw new ParsingException(source(ctx), "Invalid named argument [{}], empty key is not supported", entry.getText()); |
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ℹ️ Wording changes to remove reference to functions.
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Some improvements on the optional parameters.
Allow empty map
Currently when using an empty map to provide named parameters to a function (e.g.
match(tilte, "query", {})the user can see the following parser errorI think we should allow the user to provide an empty map without failing, especially with such a message that is difficult to read.
Remove reference to function in the parser error message:
Example:
Duplicated function arguments with the same ...is nowDuplicated function arguments with the same ...By doing this we can reuse the mapExpression outside of a function which is legit IMHO.
See POC of implementing RERANK/COMPLETION OPTIONS for an example of usage in command syntax
More tests
Also I added more tests for the parsing of MapExpression directly in ExpressionTests