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Make jsonpath .string() be immutable for datetimes.
Discussion of commited055d249
revealed that we don't actually want jsonpath's .string() method to depend on DateStyle, nor TimeZone either, because the non-"_tz" jsonpath functions are supposed to be immutable. Potentially we could allow a TimeZone dependency in the "_tz" variants, but it seems better to just uniformly define this method as returning the same string that jsonb text output would do. That's easier to implement too, saving a couple dozen lines. Patch by me, per complaint from Peter Eisentraut. Back-patch to v17 where this feature came in (in66ea94e8e
). Also back-patched055d249
to provide test cases. Discussion: https://postgr.es/m/5e8879d0-a3c8-4be2-950f-d83aa2af953a@eisentraut.org
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@ -18017,16 +18017,15 @@ ERROR: jsonpath member accessor can only be applied to an object
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</para>
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<para>
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String value converted from a JSON boolean, number, string, or
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datetime (the output format for datetimes is determined by
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the <xref linkend="guc-datestyle"/> parameter)
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datetime
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</para>
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<para>
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<literal>jsonb_path_query_array('[1.23, "xyz", false]', '$[*].string()')</literal>
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<returnvalue>["1.23", "xyz", "false"]</returnvalue>
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</para>
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<para>
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<literal>jsonb_path_query('"2023-08-15"', '$.datetime().string()')</literal>
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<returnvalue>"2023-08-15"</returnvalue>
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<literal>jsonb_path_query('"2023-08-15 12:34:56"', '$.timestamp().string()')</literal>
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<returnvalue>"2023-08-15T12:34:56"</returnvalue>
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</para></entry>
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</row>
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