Internal implementation of the user-facing Catalog.
A helper class that enables substitution using syntax like
${var}, ${system:var} and ${env:var}.
A helper class that enables substitution using syntax like
${var}, ${system:var} and ${env:var}.
Variable substitution is controlled by SQLConf.variableSubstituteEnabled.
Static SQL configuration is a cross-session, immutable Spark configuration.
Static SQL configuration is a cross-session, immutable Spark configuration. External users can
see the static sql configs via SparkSession.conf, but can NOT set/unset them.
All classes in this package are considered an internal API to Spark and are subject to change between minor releases.