[teiid-issues] [JBoss JIRA] Created: (TEIID-357) Create a cannonical set of push down functions

[Steven Hawkins (JIRA)]

Create a cannonical set of push down functions
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                 Key: TEIID-357
                 URL: https://jira.jboss.org/jira/browse/TEIID-357
             Project: Teiid
          Issue Type: Sub-task
          Components: Connector API, Query Engine
    Affects Versions: 6.0.0
            Reporter: Steven Hawkins
            Assignee: Steven Hawkins
             Fix For: 6.0.0


Currently the engine may pushdown aliases of common functions (convert/cast, nvl/ifnull, lower/lcase, etc.) duplications should be removed by the rewriter to a canonical set defined by constants so that connector developers know what system functions to expect.

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