Repository: spark Updated Branches: refs/heads/master 4e42842e8 -> 9fe3adcce
[SPARK-8248][SQL] string function: length Author: Cheng Hao <hao.ch...@intel.com> Closes #6724 from chenghao-intel/length and squashes the following commits: aaa3c31 [Cheng Hao] revert the additional change 97148a9 [Cheng Hao] remove the codegen testing temporally ae08003 [Cheng Hao] update the comments 1eb1fd1 [Cheng Hao] simplify the code as commented 3e92d32 [Cheng Hao] use the selectExpr in unit test intead of SQLQuery 3c729aa [Cheng Hao] fix bug for constant null value in codegen 3641f06 [Cheng Hao] keep the length() method for registered function 8e30171 [Cheng Hao] update the code as comment db604ae [Cheng Hao] Add code gen support 548d2ef [Cheng Hao] register the length() 09a0738 [Cheng Hao] add length support Project: http://git-wip-us.apache.org/repos/asf/spark/repo Commit: http://git-wip-us.apache.org/repos/asf/spark/commit/9fe3adcc Tree: http://git-wip-us.apache.org/repos/asf/spark/tree/9fe3adcc Diff: http://git-wip-us.apache.org/repos/asf/spark/diff/9fe3adcc Branch: refs/heads/master Commit: 9fe3adccef687c92ff1ac17d946af089c8e28d66 Parents: 4e42842 Author: Cheng Hao <hao.ch...@intel.com> Authored: Wed Jun 10 19:55:10 2015 -0700 Committer: Reynold Xin <r...@databricks.com> Committed: Wed Jun 10 19:55:10 2015 -0700 ---------------------------------------------------------------------- .../catalyst/analysis/FunctionRegistry.scala | 13 +++++++----- .../sql/catalyst/expressions/Expression.scala | 3 +++ .../catalyst/expressions/stringOperations.scala | 21 ++++++++++++++++++++ .../expressions/StringFunctionsSuite.scala | 12 +++++++++++ .../scala/org/apache/spark/sql/functions.scala | 18 +++++++++++++++++ .../spark/sql/DataFrameFunctionsSuite.scala | 20 +++++++++++++++++++ 6 files changed, 82 insertions(+), 5 deletions(-) ---------------------------------------------------------------------- http://git-wip-us.apache.org/repos/asf/spark/blob/9fe3adcc/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/FunctionRegistry.scala ---------------------------------------------------------------------- diff --git a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/FunctionRegistry.scala b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/FunctionRegistry.scala index ba89a5c..39875d7 100644 --- a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/FunctionRegistry.scala +++ b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/FunctionRegistry.scala @@ -89,14 +89,10 @@ object FunctionRegistry { expression[CreateArray]("array"), expression[Coalesce]("coalesce"), expression[Explode]("explode"), - expression[Lower]("lower"), - expression[Substring]("substr"), - expression[Substring]("substring"), expression[Rand]("rand"), expression[Randn]("randn"), expression[CreateStruct]("struct"), expression[Sqrt]("sqrt"), - expression[Upper]("upper"), // Math functions expression[Acos]("acos"), @@ -132,7 +128,14 @@ object FunctionRegistry { expression[Last]("last"), expression[Max]("max"), expression[Min]("min"), - expression[Sum]("sum") + expression[Sum]("sum"), + + // string functions + expression[Lower]("lower"), + expression[StringLength]("length"), + expression[Substring]("substr"), + expression[Substring]("substring"), + expression[Upper]("upper") ) val builtin: FunctionRegistry = { http://git-wip-us.apache.org/repos/asf/spark/blob/9fe3adcc/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Expression.scala ---------------------------------------------------------------------- diff --git a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Expression.scala b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Expression.scala index 63dd5f9..8c1e4d7 100644 --- a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Expression.scala +++ b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Expression.scala @@ -212,6 +212,9 @@ abstract class LeafExpression extends Expression with trees.LeafNode[Expression] abstract class UnaryExpression extends Expression with trees.UnaryNode[Expression] { self: Product => + override def foldable: Boolean = child.foldable + override def nullable: Boolean = child.nullable + /** * Called by unary expressions to generate a code block that returns null if its parent returns * null, and if not not null, use `f` to generate the expression. http://git-wip-us.apache.org/repos/asf/spark/blob/9fe3adcc/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringOperations.scala ---------------------------------------------------------------------- diff --git a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringOperations.scala b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringOperations.scala index 856f564..3450383 100644 --- a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringOperations.scala +++ b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringOperations.scala @@ -294,3 +294,24 @@ object Substring { apply(str, pos, Literal(Integer.MAX_VALUE)) } } + +/** + * A function that return the length of the given string expression. + */ +case class StringLength(child: Expression) extends UnaryExpression with ExpectsInputTypes { + override def dataType: DataType = IntegerType + override def expectedChildTypes: Seq[DataType] = Seq(StringType) + + override def eval(input: Row): Any = { + val string = child.eval(input) + if (string == null) null else string.asInstanceOf[UTF8String].length + } + + override def toString: String = s"length($child)" + + override def genCode(ctx: CodeGenContext, ev: GeneratedExpressionCode): String = { + defineCodeGen(ctx, ev, c => s"($c).length()") + } +} + + http://git-wip-us.apache.org/repos/asf/spark/blob/9fe3adcc/sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/StringFunctionsSuite.scala ---------------------------------------------------------------------- diff --git a/sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/StringFunctionsSuite.scala b/sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/StringFunctionsSuite.scala index 2e81296..d363e63 100644 --- a/sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/StringFunctionsSuite.scala +++ b/sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/StringFunctionsSuite.scala @@ -215,4 +215,16 @@ class StringFunctionsSuite extends SparkFunSuite with ExpressionEvalHelper { evaluate("abbbbc" rlike regEx, create_row("**")) } } + + test("length for string") { + val regEx = 'a.string.at(0) + checkEvaluation(StringLength(Literal("abc")), 3, create_row("abdef")) + checkEvaluation(StringLength(regEx), 5, create_row("abdef")) + checkEvaluation(StringLength(regEx), 0, create_row("")) + checkEvaluation(StringLength(regEx), null, create_row(null)) + // TODO currently bug in codegen, let's temporally disable this + // checkEvaluation(StringLength(Literal.create(null, StringType)), null, create_row("abdef")) + } + + } http://git-wip-us.apache.org/repos/asf/spark/blob/9fe3adcc/sql/core/src/main/scala/org/apache/spark/sql/functions.scala ---------------------------------------------------------------------- diff --git a/sql/core/src/main/scala/org/apache/spark/sql/functions.scala b/sql/core/src/main/scala/org/apache/spark/sql/functions.scala index b3fc1e6..083f6b6 100644 --- a/sql/core/src/main/scala/org/apache/spark/sql/functions.scala +++ b/sql/core/src/main/scala/org/apache/spark/sql/functions.scala @@ -37,6 +37,7 @@ import org.apache.spark.util.Utils * @groupname normal_funcs Non-aggregate functions * @groupname math_funcs Math functions * @groupname window_funcs Window functions + * @groupname string_funcs String functions * @groupname Ungrouped Support functions for DataFrames. * @since 1.3.0 */ @@ -1317,6 +1318,23 @@ object functions { */ def toRadians(columnName: String): Column = toRadians(Column(columnName)) + ////////////////////////////////////////////////////////////////////////////////////////////// + // String functions + ////////////////////////////////////////////////////////////////////////////////////////////// + + /** + * Computes the length of a given string value + * @group string_funcs + * @since 1.5.0 + */ + def strlen(e: Column): Column = StringLength(e.expr) + + /** + * Computes the length of a given string column + * @group string_funcs + * @since 1.5.0 + */ + def strlen(columnName: String): Column = strlen(Column(columnName)) ////////////////////////////////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////////////////////////////// http://git-wip-us.apache.org/repos/asf/spark/blob/9fe3adcc/sql/core/src/test/scala/org/apache/spark/sql/DataFrameFunctionsSuite.scala ---------------------------------------------------------------------- diff --git a/sql/core/src/test/scala/org/apache/spark/sql/DataFrameFunctionsSuite.scala b/sql/core/src/test/scala/org/apache/spark/sql/DataFrameFunctionsSuite.scala index b93ad39..171a215 100644 --- a/sql/core/src/test/scala/org/apache/spark/sql/DataFrameFunctionsSuite.scala +++ b/sql/core/src/test/scala/org/apache/spark/sql/DataFrameFunctionsSuite.scala @@ -109,4 +109,24 @@ class DataFrameFunctionsSuite extends QueryTest { testData2.select(bitwiseNOT($"a")), testData2.collect().toSeq.map(r => Row(~r.getInt(0)))) } + + test("length") { + checkAnswer( + nullStrings.select(strlen($"s"), strlen("s")), + nullStrings.collect().toSeq.map { r => + val v = r.getString(1) + val l = if (v == null) null else v.length + Row(l, l) + }) + + checkAnswer( + nullStrings.selectExpr("length(s)"), + nullStrings.collect().toSeq.map { r => + val v = r.getString(1) + val l = if (v == null) null else v.length + Row(l) + }) + } + + } 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