Package org.apache.calcite.adapter.spark
Class JdbcToSparkConverter
- java.lang.Object
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- org.apache.calcite.rel.AbstractRelNode
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- org.apache.calcite.rel.SingleRel
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- org.apache.calcite.rel.convert.ConverterImpl
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- org.apache.calcite.adapter.spark.JdbcToSparkConverter
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- All Implemented Interfaces:
java.lang.Cloneable
,SparkRel
,RelOptNode
,Converter
,RelNode
public class JdbcToSparkConverter extends ConverterImpl implements SparkRel
Relational expression representing a scan of a table in a JDBC data source that returns its results as a Spark RDD.
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Nested Class Summary
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Nested classes/interfaces inherited from interface org.apache.calcite.rel.RelNode
RelNode.Context
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Nested classes/interfaces inherited from interface org.apache.calcite.adapter.spark.SparkRel
SparkRel.Implementor, SparkRel.Result
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Field Summary
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Fields inherited from class org.apache.calcite.rel.convert.ConverterImpl
inTraits, traitDef
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Fields inherited from class org.apache.calcite.rel.AbstractRelNode
digest, id, rowType, traitSet
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Fields inherited from interface org.apache.calcite.adapter.spark.SparkRel
CONVENTION
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Constructor Summary
Constructors Modifier Constructor Description protected
JdbcToSparkConverter(RelOptCluster cluster, RelTraitSet traits, RelNode input)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description RelOptCost
computeSelfCost(RelOptPlanner planner, RelMetadataQuery mq)
Returns the cost of this plan (not including children).RelNode
copy(RelTraitSet traitSet, java.util.List<RelNode> inputs)
Creates a copy of this relational expression, perhaps changing traits and inputs.private java.lang.String
generateSql(SqlDialect dialect)
SparkRel.Result
implementSpark(SparkRel.Implementor implementor)
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Methods inherited from class org.apache.calcite.rel.convert.ConverterImpl
cannotImplement, getInputTraits, getTraitDef
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Methods inherited from class org.apache.calcite.rel.SingleRel
childrenAccept, deriveRowType, estimateRowCount, explainTerms, getInput, getInputs, replaceInput
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Methods inherited from class org.apache.calcite.rel.AbstractRelNode
accept, accept, collectVariablesSet, collectVariablesUsed, computeDigest, computeSelfCost, explain, getChildExps, getCluster, getCollationList, getConvention, getCorrelVariable, getDescription, getDigest, getExpectedInputRowType, getId, getInput, getQuery, getRelTypeName, getRows, getRowType, getTable, getTraitSet, getVariablesSet, getVariablesStopped, isDistinct, isKey, isValid, isValid, metadata, onRegister, recomputeDigest, register, sole, toString
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Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
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Methods inherited from interface org.apache.calcite.rel.RelNode
accept, accept, childrenAccept, collectVariablesSet, collectVariablesUsed, computeSelfCost, estimateRowCount, explain, getChildExps, getCollationList, getConvention, getCorrelVariable, getExpectedInputRowType, getInput, getInputs, getQuery, getRelTypeName, getRows, getRowType, getTable, getVariablesSet, getVariablesStopped, isDistinct, isKey, isValid, isValid, metadata, onRegister, recomputeDigest, register, replaceInput
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Methods inherited from interface org.apache.calcite.plan.RelOptNode
getCluster, getDescription, getDigest, getId, getTraitSet
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Constructor Detail
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JdbcToSparkConverter
protected JdbcToSparkConverter(RelOptCluster cluster, RelTraitSet traits, RelNode input)
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Method Detail
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copy
public RelNode copy(RelTraitSet traitSet, java.util.List<RelNode> inputs)
Description copied from interface:RelNode
Creates a copy of this relational expression, perhaps changing traits and inputs.Sub-classes with other important attributes are encouraged to create variants of this method with more parameters.
- Specified by:
copy
in interfaceRelNode
- Overrides:
copy
in classAbstractRelNode
- Parameters:
traitSet
- Trait setinputs
- Inputs- Returns:
- Copy of this relational expression, substituting traits and inputs
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computeSelfCost
public RelOptCost computeSelfCost(RelOptPlanner planner, RelMetadataQuery mq)
Description copied from interface:RelNode
Returns the cost of this plan (not including children). The base implementation throws an error; derived classes should override.NOTE jvs 29-Mar-2006: Don't call this method directly. Instead, use
RelMetadataQuery.getNonCumulativeCost(org.apache.calcite.rel.RelNode)
, which gives plugins a chance to override the rel's default ideas about cost.- Specified by:
computeSelfCost
in interfaceRelNode
- Overrides:
computeSelfCost
in classConverterImpl
- Parameters:
planner
- Planner for cost calculationmq
- Metadata query- Returns:
- Cost of this plan (not including children)
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implementSpark
public SparkRel.Result implementSpark(SparkRel.Implementor implementor)
- Specified by:
implementSpark
in interfaceSparkRel
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generateSql
private java.lang.String generateSql(SqlDialect dialect)
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