object Sparql2SQL
A SPARQL to SQL rewritter based on HDT schema.
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def
createFilterString(cond: Expr): String
Return a complete FILTER expression.
Return a complete FILTER expression.
- cond
a FILTER operator.
- returns
a complete FILTER expression.
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eq(arg0: AnyRef): Boolean
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equals(arg0: Any): Boolean
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def
filterHDT(cond: Expr): String
Map FILTER conditions over HDT schema.
Map FILTER conditions over HDT schema.
- cond
a FILTER condition.
- returns
a filter operator based on the HDT schema fields.
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def
getColumnName(value: String): String
Return HDT column names.
Return HDT column names.
- value
one of SPO.
- returns
HDT column name.
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def
getDistinct: String
Get DISTINCT clauses.
Get DISTINCT clauses.
- returns
a DISTINCT clause mapped to HDT schema.
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def
getFilterCondition: String
Get FILTER expression
Get FILTER expression
- returns
a FILTER condition
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def
getProjectionFields: String
A solution sequence which is transformed into one involving only a subset of the variables present into SPARQL query.
A solution sequence which is transformed into one involving only a subset of the variables present into SPARQL query.
- returns
a projection fields.
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def
getQuery(queryStr: String): String
Return SQL query rewritten from SPARQL query and mapped into HDT partition.
Return SQL query rewritten from SPARQL query and mapped into HDT partition.
- queryStr
a SPARQL query string.
- returns
SQL query.
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def
getWhereCondition: String
Map WHERE conditions into clauses.
Map WHERE conditions into clauses.
- returns
a SQL WHERE clause using HDT schema.
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hashCode(): Int
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def
isCountEnabled: Boolean
Check if COUNT clause is present on SPARQL query.
Check if COUNT clause is present on SPARQL query.
- returns
true if present, false otherwise.
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