Add a configuration property that sets the variable substitution max depth
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Key: HIVE-2021
URL: https://issues.apache.org/jira/browse/HIVE-2021
Project: Hive
Issue Type: Improvement
Components: Configuration, Query Processor
Reporter: Carl Steinbach
The VariableSubstitution class contains a hardcoded MAX_SUBST=40 value which
defines the maximum number of variable references that are allowed to appear in
a single Hive statement. This value should be configurable via hiveconf.
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