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CatalystConf

2012-03-26 分类：spark-sql 阅读(1547) 评论(0)

CatalystConf

CatalystConf is…FIXME

Note	The default `CatalystConf` is SQLConf that is…FIXME

Table 1. CatalystConf’s Internal Properties
Name	Initial Value	Description
`caseSensitiveAnalysis`
`cboEnabled`		Enables cost-based optimizations (CBO) for estimation of plan statistics when enabled. Used in CostBasedJoinReorder logical plan optimization and `Project`, `Filter`, `Join` and `Aggregate` logical operators.
`optimizerMaxIterations`	spark.sql.optimizer.maxIterations	Maximum number of iterations for Analyzer and Optimizer.
`sessionLocalTimeZone`

`resolver` Method

resolver gives case-sensitive or case-insensitive Resolvers per caseSensitiveAnalysis setting.

Note	`Resolver` is a mere function of two `String` parameters that returns `true` if both refer to the same entity (i.e. for case insensitive equality).

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