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[SPARK-23880][SQL] Do not trigger any jobs for caching data
## What changes were proposed in this pull request? This pr fixed code so that `cache` could prevent any jobs from being triggered. For example, in the current master, an operation below triggers a actual job; ``` val df = spark.range(10000000000L) .filter('id > 1000) .orderBy('id.desc) .cache() ``` This triggers a job while the cache should be lazy. The problem is that, when creating `InMemoryRelation`, we build the RDD, which calls `SparkPlan.execute` and may trigger jobs, like sampling job for range partitioner, or broadcast job. This pr removed the code to build a cached `RDD` in the constructor of `InMemoryRelation` and added `CachedRDDBuilder` to lazily build the `RDD` in `InMemoryRelation`. Then, the first call of `CachedRDDBuilder.cachedColumnBuffers` triggers a job to materialize the cache in `InMemoryTableScanExec` . ## How was this patch tested? Added tests in `CachedTableSuite`. Author: Takeshi Yamamuro <yamamuro@apache.org> Closes #21018 from maropu/SPARK-23880.
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