[
https://issues.apache.org/jira/browse/FLINK-10059?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16586215#comment-16586215
]
ASF GitHub Bot commented on FLINK-10059:
----------------------------------------
asfgit closed pull request #6494: [FLINK-10059] [table] Add LTRIM supported in
Table API and SQL
URL: https://github.com/apache/flink/pull/6494
This is a PR merged from a forked repository.
As GitHub hides the original diff on merge, it is displayed below for
the sake of provenance:
As this is a foreign pull request (from a fork), the diff is supplied
below (as it won't show otherwise due to GitHub magic):
diff --git a/docs/dev/table/functions.md b/docs/dev/table/functions.md
index eac6d16eaf8..59585a6547f 100644
--- a/docs/dev/table/functions.md
+++ b/docs/dev/table/functions.md
@@ -2482,6 +2482,18 @@ TO_BASE64(string)
<p>E.g., <code>TO_BASE64('hello world')</code> returns
"aGVsbG8gd29ybGQ=".</p>
</td>
</tr>
+
+ <tr>
+ <td>
+ {% highlight text %}
+LTRIM(string)
+{% endhighlight %}
+ </td>
+ <td>
+ <p>Returns the result string which trimmed the left spaces from the
base string; returns NULL if <i>string</i> is NULL.</p>
+ <p>E.g., <code>LTRIM(' This is a test String.')</code> returns "This
is a test String.".</p>
+ </td>
+ </tr>
</tbody>
</table>
</div>
@@ -2674,6 +2686,18 @@ STRING.toBase64()
<p>E.g., <code>'hello world'.toBase64()</code> returns
"aGVsbG8gd29ybGQ=".</p>
</td>
</tr>
+
+ <tr>
+ <td>
+ {% highlight java %}
+STRING.ltrim()
+{% endhighlight %}
+ </td>
+ <td>
+ <p>Returns the result string which trimmed the left spaces from the
base string; returns NULL if <i>string</i> is NULL.</p>
+ <p>E.g., <code>' This is a test String.'.ltrim()</code> returns "This
is a test String.".</p>
+ </td>
+ </tr>
</tbody>
</table>
@@ -2866,6 +2890,18 @@ STRING.toBase64()
<p>E.g., <code>"hello world".toBase64()</code> returns
"aGVsbG8gd29ybGQ=".</p>
</td>
</tr>
+
+ <tr>
+ <td>
+ {% highlight scala %}
+STRING.ltrim()
+{% endhighlight %}
+ </td>
+ <td>
+ <p>Returns the result string which trimmed the left spaces from the
base string; returns NULL if <i>string</i> is NULL.</p>
+ <p>E.g., <code>' This is a test String.'.ltrim()</code> returns "This
is a test String.".</p>
+ </td>
+ </tr>
</tbody>
</table>
</div>
diff --git
a/flink-libraries/flink-table/src/main/scala/org/apache/flink/table/api/scala/expressionDsl.scala
b/flink-libraries/flink-table/src/main/scala/org/apache/flink/table/api/scala/expressionDsl.scala
index dfe69cb0411..189512de1cc 100644
---
a/flink-libraries/flink-table/src/main/scala/org/apache/flink/table/api/scala/expressionDsl.scala
+++
b/flink-libraries/flink-table/src/main/scala/org/apache/flink/table/api/scala/expressionDsl.scala
@@ -563,6 +563,11 @@ trait ImplicitExpressionOperations {
*/
def toBase64() = ToBase64(expr)
+ /**
+ * Returns the result string which trimmed the left spaces from the base
string.
+ */
+ def ltrim() = LTrim(expr)
+
// Temporal operations
/**
diff --git
a/flink-libraries/flink-table/src/main/scala/org/apache/flink/table/codegen/calls/FunctionGenerator.scala
b/flink-libraries/flink-table/src/main/scala/org/apache/flink/table/codegen/calls/FunctionGenerator.scala
index a29259b8ad8..b715d5f450f 100644
---
a/flink-libraries/flink-table/src/main/scala/org/apache/flink/table/codegen/calls/FunctionGenerator.scala
+++
b/flink-libraries/flink-table/src/main/scala/org/apache/flink/table/codegen/calls/FunctionGenerator.scala
@@ -164,6 +164,12 @@ object FunctionGenerator {
STRING_TYPE_INFO,
BuiltInMethods.UUID)
+ addSqlFunctionMethod(
+ LTRIM,
+ Seq(STRING_TYPE_INFO),
+ STRING_TYPE_INFO,
+ BuiltInMethod.LTRIM.method)
+
//
----------------------------------------------------------------------------------------------
// Arithmetic functions
//
----------------------------------------------------------------------------------------------
diff --git
a/flink-libraries/flink-table/src/main/scala/org/apache/flink/table/expressions/stringExpressions.scala
b/flink-libraries/flink-table/src/main/scala/org/apache/flink/table/expressions/stringExpressions.scala
index f844308172c..be3c321d5f6 100644
---
a/flink-libraries/flink-table/src/main/scala/org/apache/flink/table/expressions/stringExpressions.scala
+++
b/flink-libraries/flink-table/src/main/scala/org/apache/flink/table/expressions/stringExpressions.scala
@@ -410,3 +410,27 @@ case class ToBase64(child: Expression) extends
UnaryExpression with InputTypeSpe
override def toString: String = s"($child).toBase64"
}
+
+/**
+ * Returns the result string which trimmed the left spaces from the base
string.
+ */
+case class LTrim(child: Expression) extends UnaryExpression with InputTypeSpec
{
+ override private[flink] def expectedTypes: Seq[TypeInformation[_]] =
Seq(STRING_TYPE_INFO)
+
+ override private[flink] def resultType: TypeInformation[_] = STRING_TYPE_INFO
+
+ override private[flink] def validateInput(): ValidationResult = {
+ if (child.resultType == STRING_TYPE_INFO) {
+ ValidationSuccess
+ } else {
+ ValidationFailure(s"Ltrim operator requires a String input, " +
+ s"but $child is of type ${child.resultType}")
+ }
+ }
+
+ override private[flink] def toRexNode(implicit relBuilder: RelBuilder):
RexNode = {
+ relBuilder.call(ScalarSqlFunctions.LTRIM, child.toRexNode)
+ }
+
+ override def toString = s"($child).ltrim"
+}
diff --git
a/flink-libraries/flink-table/src/main/scala/org/apache/flink/table/functions/sql/ScalarSqlFunctions.scala
b/flink-libraries/flink-table/src/main/scala/org/apache/flink/table/functions/sql/ScalarSqlFunctions.scala
index 0df4468599c..f3753ec8cb0 100644
---
a/flink-libraries/flink-table/src/main/scala/org/apache/flink/table/functions/sql/ScalarSqlFunctions.scala
+++
b/flink-libraries/flink-table/src/main/scala/org/apache/flink/table/functions/sql/ScalarSqlFunctions.scala
@@ -206,4 +206,12 @@ object ScalarSqlFunctions {
SqlFunctionCategory.STRING
)
+ val LTRIM = new SqlFunction(
+ "LTRIM",
+ SqlKind.OTHER_FUNCTION,
+ ReturnTypes.cascade(ReturnTypes.explicit(SqlTypeName.VARCHAR),
SqlTypeTransforms.TO_NULLABLE),
+ InferTypes.RETURN_TYPE,
+ OperandTypes.STRING,
+ SqlFunctionCategory.STRING)
+
}
diff --git
a/flink-libraries/flink-table/src/main/scala/org/apache/flink/table/validate/FunctionCatalog.scala
b/flink-libraries/flink-table/src/main/scala/org/apache/flink/table/validate/FunctionCatalog.scala
index f5d13305349..49f73f4ee47 100644
---
a/flink-libraries/flink-table/src/main/scala/org/apache/flink/table/validate/FunctionCatalog.scala
+++
b/flink-libraries/flink-table/src/main/scala/org/apache/flink/table/validate/FunctionCatalog.scala
@@ -205,6 +205,7 @@ object FunctionCatalog {
"fromBase64" -> classOf[FromBase64],
"toBase64" -> classOf[ToBase64],
"uuid" -> classOf[UUID],
+ "ltrim" -> classOf[LTrim],
// math functions
"plus" -> classOf[Plus],
@@ -455,6 +456,7 @@ class BasicOperatorTable extends ReflectiveSqlOperatorTable
{
ScalarSqlFunctions.FROM_BASE64,
ScalarSqlFunctions.TO_BASE64,
ScalarSqlFunctions.UUID,
+ ScalarSqlFunctions.LTRIM,
// EXTENSIONS
BasicOperatorTable.TUMBLE,
diff --git
a/flink-libraries/flink-table/src/test/scala/org/apache/flink/table/expressions/ScalarFunctionsTest.scala
b/flink-libraries/flink-table/src/test/scala/org/apache/flink/table/expressions/ScalarFunctionsTest.scala
index 145f3c5fba3..5ab0c679df1 100644
---
a/flink-libraries/flink-table/src/test/scala/org/apache/flink/table/expressions/ScalarFunctionsTest.scala
+++
b/flink-libraries/flink-table/src/test/scala/org/apache/flink/table/expressions/ScalarFunctionsTest.scala
@@ -626,6 +626,33 @@ class ScalarFunctionsTest extends ScalarTypesTestBase {
"-")
}
+ @Test
+ def testLTrim(): Unit = {
+ testAllApis(
+ 'f8.ltrim(),
+ "f8.ltrim",
+ "LTRIM(f8)",
+ "This is a test String. ")
+
+ testAllApis(
+ 'f0.ltrim(),
+ "f0.ltrim",
+ "LTRIM(f0)",
+ "This is a test String.")
+
+ testAllApis(
+ "".ltrim(),
+ "''.ltrim()",
+ "LTRIM('')",
+ "")
+
+ testAllApis(
+ 'f33.ltrim(),
+ "f33.ltrim",
+ "LTRIM(f33)",
+ "null")
+ }
+
//
----------------------------------------------------------------------------------------------
// Math functions
//
----------------------------------------------------------------------------------------------
diff --git
a/flink-libraries/flink-table/src/test/scala/org/apache/flink/table/expressions/SqlExpressionTest.scala
b/flink-libraries/flink-table/src/test/scala/org/apache/flink/table/expressions/SqlExpressionTest.scala
index 5846fc0af0d..f1e7ab36dcb 100644
---
a/flink-libraries/flink-table/src/test/scala/org/apache/flink/table/expressions/SqlExpressionTest.scala
+++
b/flink-libraries/flink-table/src/test/scala/org/apache/flink/table/expressions/SqlExpressionTest.scala
@@ -149,6 +149,7 @@ class SqlExpressionTest extends ExpressionTestBase {
testSqlApi("RPAD('hi',4,'??')", "hi??")
testSqlApi("FROM_BASE64('aGVsbG8gd29ybGQ=')", "hello world")
testSqlApi("TO_BASE64('hello world')", "aGVsbG8gd29ybGQ=")
+ testSqlApi("LTRIM(' This is a test String.')", "This is a test String.")
}
@Test
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> Add LTRIM supported in Table API and SQL
> ----------------------------------------
>
> Key: FLINK-10059
> URL: https://issues.apache.org/jira/browse/FLINK-10059
> Project: Flink
> Issue Type: Sub-task
> Components: Table API & SQL
> Reporter: vinoyang
> Assignee: vinoyang
> Priority: Minor
> Labels: pull-request-available
> Fix For: 1.7.0
>
>
> refer to MYSQL ltrim function :
> https://dev.mysql.com/doc/refman/8.0/en/string-functions.html#function_ltrim
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