OpenACS

PostgreSQL supports range types since 9.5. When using range types,

square braces have to be used in SQL statements. Since OpenACS uses

always Tcl substitution in .xql files, and OpenACS does NOT allow

backslash substitution in these files, square brackets could not be

escaped and therefore not be used in .xql files so far. This change

allows now a developer to deactivate the substitution by passing

e.g. "-subst none" to the db_* command using the .xql file. Valid

values for "-subst" are "all", "none", "vars", and "commands", default

is "all" which is exactly the behavior of before. Therefore, this

change is fully backward compatible.

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