On Tuesday, September 16, 2025, Robert Haas <
robertmhaas@gmail.com> wrote:
On Tue, Sep 16, 2025 at 12:56 AM David G. Johnston
<david.g.johnston@gmail.com> wrote:
> If there are no function names present, output “expr” in lieu of a function name. Then just output any columns that are present. No operators, no constants.
In the previous discussion, the user's expression indexes were on
these expressions:
jsondata -> 'a' -> 'b'
jsondata -> 'x' -> 'y'
So "no operators, no constants" wouldn't really allow us to make any
useful progress, inasmuch as it would throw away everything that
matters.
Wouldn’t mind special-casing json/jsonb in the algorithm: tbl_col.const.const_idx
More generally, maybe map all the various common accessor operators to “.” instead of using them directly and capture the constants when chained from a column.
This forces the need for double-quoting but that doesn’t seem like something we can really avoid.
Keeps the name short by collapsing the operator to a single symbol, and removing single quotes from the constants.
David J.
