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https://issues.apache.org/jira/browse/PHOENIX-4654?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16399787#comment-16399787
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James Taylor commented on PHOENIX-4654:
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There's a subtle distinction in using a null tenantId and an empty string
tenantId. The latter will do as you mention (add an IS NULL clause), but the
former is a way to get all tenants - global and multi-tenant.
> In PhoenixDatabaseMetaData.addTenantIdFilter add WHERE TENANT_ID is NULL when
> the connection used does not have a tenant id
> ----------------------------------------------------------------------------------------------------------------------------
>
> Key: PHOENIX-4654
> URL: https://issues.apache.org/jira/browse/PHOENIX-4654
> Project: Phoenix
> Issue Type: Bug
> Reporter: Thomas D'Silva
> Assignee: Thomas D'Silva
> Priority: Major
>
> or else we end up doing a full table scan
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