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fix the head notation of package object dsl #632

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fix the head notation of package object dsl #632

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66ff53b
fix the head notation of package object dsl
May 4, 2014
d2d1a9d
Update package.scala
May 7, 2014
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21 changes: 12 additions & 9 deletions sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/dsl/package.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -31,26 +31,29 @@ import org.apache.spark.sql.catalyst.types._
* A collection of implicit conversions that create a DSL for constructing catalyst data structures.
*
* {{{
* scala> import catalyst.dsl._
* scala> import org.apache.spark.sql.catalyst.dsl.expressions._
*
* // Standard operators are added to expressions.
* scala> import org.apache.spark.sql.catalyst.expressions.Literal
* scala> Literal(1) + Literal(1)
* res1: catalyst.expressions.Add = (1 + 1)
* res0: org.apache.spark.sql.catalyst.expressions.Add = (1 + 1)
*
* // There is a conversion from 'symbols to unresolved attributes.
* scala> 'a.attr
* res2: catalyst.analysis.UnresolvedAttribute = 'a
* res1: org.apache.spark.sql.catalyst.analysis.UnresolvedAttribute = 'a
*
* // These unresolved attributes can be used to create more complicated expressions.
* scala> 'a === 'b
* res3: catalyst.expressions.Equals = ('a = 'b)
* res2: org.apache.spark.sql.catalyst.expressions.Equals = ('a = 'b)
*
* // SQL verbs can be used to construct logical query plans.
* scala> TestRelation('key.int, 'value.string).where('key === 1).select('value).analyze
* res4: catalyst.plans.logical.LogicalPlan =
* Project {value#1}
* Filter (key#0 = 1)
* TestRelation {key#0,value#1}
* scala> import org.apache.spark.sql.catalyst.plans.logical._
* scala> import org.apache.spark.sql.catalyst.dsl.plans._
* scala> LocalRelation('key.int, 'value.string).where('key === 1).select('value).analyze
* res3: org.apache.spark.sql.catalyst.plans.logical.LogicalPlan =
* Project [value#3]
* Filter (key#2 = 1)
* LocalRelation [key#2,value#3], []
* }}}
*/
package object dsl {
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