[SPARK-19265][SQL][FOLLOW-UP] Configurable `tableRelationCache` maximum size

## What changes were proposed in this pull request?

SPARK-19265 had made table relation cache general; this follow-up aims to make `tableRelationCache`'s maximum size configurable.

In order to do sanity-check, this patch also adds a `checkValue()` method to `TypedConfigBuilder`.

## How was this patch tested?

new test case: `test("conf entry: checkValue()")`

Author: Liwei Lin <lwlin7@gmail.com>

Closes #16736 from lw-lin/conf.

1 files changed, 8 insertions, 0 deletions

diff --git a/core/src/main/scala/org/apache/spark/internal/config/ConfigBuilder.scala b/core/src/main/scala/org/apache/spark/internal/config/ConfigBuilder.scala
index 0f5c8a9e02..a177e66645 100644
--- a/core/src/main/scala/org/apache/spark/internal/config/ConfigBuilder.scala
+++ b/core/src/main/scala/org/apache/spark/internal/config/ConfigBuilder.scala
@@ -90,6 +90,14 @@ private[spark] class TypedConfigBuilder[T](
     new TypedConfigBuilder(parent, s => fn(converter(s)), stringConverter)
   }
 
+  /** Checks if the user-provided value for the config matches the validator. */
+  def checkValue(validator: T => Boolean, errorMsg: String): TypedConfigBuilder[T] = {
+    transform { v =>
+      if (!validator(v)) throw new IllegalArgumentException(errorMsg)
+      v
+    }
+  }
+
   /** Check that user-provided values for the config match a pre-defined set. */
   def checkValues(validValues: Set[T]): TypedConfigBuilder[T] = {
     transform { v =>