feat(spanner/spannertest): support JSON_VALUE function #5173
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Adds support for the JSON_VALUE function. The function always returns an empty string, as there is no XPath query engine available in the Spanner client library. This does however enable the usage of computed columns that use the function. This change also fixes the TODO that generated columns cannot be added to non-empty tables. Fixes #5167
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This was referenced Dec 10, 2021
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Adds support for the JSON_VALUE function. The function always returns an empty string,
as there is no XPath query engine available in the Spanner client library. This does
however enable the usage of computed columns that use the function.
This change also fixes the TODO that generated columns cannot be added to non-empty
tables.
Fixes #5167