public class SQLTransformer extends Transformer
SQLTransformer
supports statements like:
- SELECT a, a + b AS a_b FROM __THIS__
- SELECT a, SQRT(b) AS b_sqrt FROM __THIS__ where a > 5
- SELECT a, b, SUM(c) AS c_sum FROM __THIS__ GROUP BY a, bConstructor and Description |
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SQLTransformer() |
SQLTransformer(java.lang.String uid) |
Modifier and Type | Method and Description |
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SQLTransformer |
copy(ParamMap extra)
Creates a copy of this instance with the same UID and some extra params.
|
java.lang.String |
getStatement() |
static SQLTransformer |
load(java.lang.String path) |
SQLTransformer |
setStatement(java.lang.String value) |
Param<java.lang.String> |
statement()
SQL statement parameter.
|
DataFrame |
transform(DataFrame dataset)
Transforms the input dataset.
|
StructType |
transformSchema(StructType schema)
:: DeveloperApi ::
|
java.lang.String |
uid()
An immutable unique ID for the object and its derivatives.
|
transform, transform, transform
transformSchema
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
clear, copyValues, defaultCopy, defaultParamMap, explainParam, explainParams, extractParamMap, extractParamMap, get, getDefault, getOrDefault, getParam, hasDefault, hasParam, isDefined, isSet, paramMap, params, set, set, set, setDefault, setDefault, shouldOwn, validateParams
toString
initializeIfNecessary, initializeLogging, isTraceEnabled, log_, log, logDebug, logDebug, logError, logError, logInfo, logInfo, logName, logTrace, logTrace, logWarning, logWarning
public SQLTransformer(java.lang.String uid)
public SQLTransformer()
public static SQLTransformer load(java.lang.String path)
public java.lang.String uid()
Identifiable
public final Param<java.lang.String> statement()
public SQLTransformer setStatement(java.lang.String value)
public java.lang.String getStatement()
public DataFrame transform(DataFrame dataset)
Transformer
transform
in class Transformer
dataset
- (undocumented)public StructType transformSchema(StructType schema)
PipelineStage
Derives the output schema from the input schema.
transformSchema
in class PipelineStage
schema
- (undocumented)public SQLTransformer copy(ParamMap extra)
Params
copy
in interface Params
copy
in class Transformer
extra
- (undocumented)defaultCopy()