Package org.apache.drill.exec.record.metadata.schema.parser

Class SchemaVisitor

java.lang.Object

org.antlr.v4.runtime.tree.AbstractParseTreeVisitor<TupleMetadata>

org.apache.drill.exec.record.metadata.schema.parser.SchemaParserBaseVisitor<TupleMetadata>

org.apache.drill.exec.record.metadata.schema.parser.SchemaVisitor

All Implemented Interfaces:

org.antlr.v4.runtime.tree.ParseTreeVisitor<TupleMetadata>, SchemaParserVisitor<TupleMetadata>

public class SchemaVisitor
extends SchemaParserBaseVisitor<TupleMetadata>

Visits schema and stores metadata about its columns into TupleMetadata class.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	SchemaVisitor.ColumnDefVisitor	Visits column definition, adds column properties to ColumnMetadata if present.
static class	SchemaVisitor.ColumnVisitor	Visits various types of columns (primitive, struct, map, array) and stores their metadata into ColumnMetadata class.
static class	SchemaVisitor.PropertiesVisitor	Visits schema or column properties.

Constructor Summary

Constructors

Constructor	Description
SchemaVisitor()

Method Summary

Modifier and Type	Method	Description
TupleMetadata	visitColumns(SchemaParser.ColumnsContext ctx)	Visit a parse tree produced by SchemaParser.columns().
TupleMetadata	visitSchema(SchemaParser.SchemaContext ctx)	Visit a parse tree produced by SchemaParser.schema().

Methods inherited from class org.apache.drill.exec.record.metadata.schema.parser.SchemaParserBaseVisitor

visitArray_map_type_def, visitArray_simple_type_def, visitArray_struct_type_def, visitArray_type, visitArray_union_type_def, visitBigint, visitBinary, visitBoolean, visitColumn, visitColumn_def, visitComplex_array_column, visitComplex_array_type, visitDate, visitDecimal, visitDefault_value, visitDouble, visitDynamic, visitFloat, visitFormat_value, visitId, visitInt, visitInterval, visitInterval_day, visitInterval_year, visitMap_column, visitMap_key_simple_type_def, visitMap_key_type_def, visitMap_type, visitMap_value_array_type_def, visitMap_value_map_type_def, visitMap_value_simple_type_def, visitMap_value_struct_type_def, visitMap_value_type_def, visitMap_value_union_type_def, visitNullability, visitPrimitive_column, visitProperty_pair, visitProperty_values, visitQuoted_id, visitSimple_array_column, visitSimple_array_type, visitSmallint, visitString_value, visitStruct_column, visitStruct_type, visitTime, visitTimestamp, visitTinyint, visitUnion_column, visitUnion_type, visitUnit1, visitUnit2, visitUnit4, visitUnit8, visitVarchar

Methods inherited from class org.antlr.v4.runtime.tree.AbstractParseTreeVisitor

aggregateResult, defaultResult, shouldVisitNextChild, visit, visitChildren, visitErrorNode, visitTerminal

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.antlr.v4.runtime.tree.ParseTreeVisitor

visit, visitChildren, visitErrorNode, visitTerminal

Constructor Details

SchemaVisitor

public SchemaVisitor()

Method Details

visitSchema

public TupleMetadata visitSchema(SchemaParser.SchemaContext ctx)

Description copied from class: SchemaParserBaseVisitor

Visit a parse tree produced by SchemaParser.schema().

The default implementation returns the result of calling AbstractParseTreeVisitor.visitChildren(org.antlr.v4.runtime.tree.RuleNode) on ctx.

Specified by:

visitSchema in interface SchemaParserVisitor<TupleMetadata>

Overrides:

visitSchema in class SchemaParserBaseVisitor<TupleMetadata>

Parameters:

ctx - the parse tree

Returns:

the visitor result

visitColumns

public TupleMetadata visitColumns(SchemaParser.ColumnsContext ctx)

Description copied from class: SchemaParserBaseVisitor

Visit a parse tree produced by SchemaParser.columns().

The default implementation returns the result of calling AbstractParseTreeVisitor.visitChildren(org.antlr.v4.runtime.tree.RuleNode) on ctx.

Specified by:

visitColumns in interface SchemaParserVisitor<TupleMetadata>

Overrides:

visitColumns in class SchemaParserBaseVisitor<TupleMetadata>

Parameters:

ctx - the parse tree

Returns:

the visitor result