Package org.apache.drill.exec.store.ischema

Class InfoSchemaFilterBuilder

java.lang.Object

org.apache.drill.common.expression.visitors.AbstractExprVisitor<InfoSchemaFilter.ExprNode,Void,RuntimeException>

org.apache.drill.exec.store.ischema.InfoSchemaFilterBuilder

All Implemented Interfaces:

ExprVisitor<InfoSchemaFilter.ExprNode,Void,RuntimeException>

public class InfoSchemaFilterBuilder
extends AbstractExprVisitor<InfoSchemaFilter.ExprNode,Void,RuntimeException>

Builds a InfoSchemaFilter out of the Filter condition. Currently we look only for certain conditions. Mainly conditions involving columns "CATALOG_NAME, "TABLE_NAME", "SCHEMA_NAME", "TABLE_SCHEMA" and "COLUMN_NAME", and functions EQUAL, NOT EQUAL, LIKE, OR and AND.

Constructor Summary

Constructors

Constructor	Description
InfoSchemaFilterBuilder(LogicalExpression filter)

Method Summary

Modifier and Type	Method	Description
InfoSchemaFilter	build()
boolean	isAllExpressionsConverted()
InfoSchemaFilter.ExprNode	visitBooleanOperator(BooleanOperator op, Void value)
InfoSchemaFilter.ExprNode	visitCastExpression(CastExpression e, Void value)
InfoSchemaFilter.ExprNode	visitFunctionCall(FunctionCall call, Void value)
InfoSchemaFilter.ExprNode	visitQuotedStringConstant(ValueExpressions.QuotedString e, Void value)
InfoSchemaFilter.ExprNode	visitSchemaPath(SchemaPath path, Void value)
InfoSchemaFilter.ExprNode	visitUnknown(LogicalExpression e, Void value)	Handles implementation-specific expressions not known to the visitor structure.

Methods inherited from class org.apache.drill.common.expression.visitors.AbstractExprVisitor

visitAnyValueExpression, visitBooleanConstant, visitConvertExpression, visitDateConstant, visitDecimal18Constant, visitDecimal28Constant, visitDecimal38Constant, visitDecimal9Constant, visitDoubleConstant, visitFloatConstant, visitFunctionHolderExpression, visitIfExpression, visitIntConstant, visitIntervalDayConstant, visitIntervalYearConstant, visitLongConstant, visitNullConstant, visitNullExpression, visitParameter, visitTimeConstant, visitTimeStampConstant, visitTypedFieldExpr, visitVarDecimalConstant

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

InfoSchemaFilterBuilder

public InfoSchemaFilterBuilder(LogicalExpression filter)

Method Details

build

public InfoSchemaFilter build()

isAllExpressionsConverted

public boolean isAllExpressionsConverted()

visitFunctionCall

public InfoSchemaFilter.ExprNode visitFunctionCall(FunctionCall call,
 Void value)
                                            throws RuntimeException

Specified by:

visitFunctionCall in interface ExprVisitor<InfoSchemaFilter.ExprNode,Void,RuntimeException>

Overrides:

visitFunctionCall in class AbstractExprVisitor<InfoSchemaFilter.ExprNode,Void,RuntimeException>

Throws:

RuntimeException

visitBooleanOperator

public InfoSchemaFilter.ExprNode visitBooleanOperator(BooleanOperator op,
 Void value)
                                               throws RuntimeException

Specified by:

visitBooleanOperator in interface ExprVisitor<InfoSchemaFilter.ExprNode,Void,RuntimeException>

Overrides:

visitBooleanOperator in class AbstractExprVisitor<InfoSchemaFilter.ExprNode,Void,RuntimeException>

Throws:

RuntimeException

visitCastExpression

public InfoSchemaFilter.ExprNode visitCastExpression(CastExpression e,
 Void value)
                                              throws RuntimeException

Specified by:

visitCastExpression in interface ExprVisitor<InfoSchemaFilter.ExprNode,Void,RuntimeException>

Overrides:

visitCastExpression in class AbstractExprVisitor<InfoSchemaFilter.ExprNode,Void,RuntimeException>

Throws:

RuntimeException

visitQuotedStringConstant

public InfoSchemaFilter.ExprNode visitQuotedStringConstant(ValueExpressions.QuotedString e,
 Void value)
                                                    throws RuntimeException

Specified by:

visitQuotedStringConstant in interface ExprVisitor<InfoSchemaFilter.ExprNode,Void,RuntimeException>

Overrides:

visitQuotedStringConstant in class AbstractExprVisitor<InfoSchemaFilter.ExprNode,Void,RuntimeException>

Throws:

RuntimeException

visitSchemaPath

public InfoSchemaFilter.ExprNode visitSchemaPath(SchemaPath path,
 Void value)
                                          throws RuntimeException

Specified by:

visitSchemaPath in interface ExprVisitor<InfoSchemaFilter.ExprNode,Void,RuntimeException>

Overrides:

visitSchemaPath in class AbstractExprVisitor<InfoSchemaFilter.ExprNode,Void,RuntimeException>

Throws:

RuntimeException

visitUnknown

public InfoSchemaFilter.ExprNode visitUnknown(LogicalExpression e,
 Void value)
                                       throws RuntimeException

Description copied from class: AbstractExprVisitor

Handles implementation-specific expressions not known to the visitor structure. Since there are no "visitFoo" methods for these "unknown" expressions, subclassses should use the functionally-equivalent instanceof approach to parse out these "unknown" expressions.

Specified by:

visitUnknown in interface ExprVisitor<InfoSchemaFilter.ExprNode,Void,RuntimeException>

Overrides:

visitUnknown in class AbstractExprVisitor<InfoSchemaFilter.ExprNode,Void,RuntimeException>

Throws:

RuntimeException